by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
Today’s report is the final part of the guest blog from HiveSeeker. He tells us about the various pellets he tested and gives their results.
If you’d like to write a guest post for this blog, please email me.
Over to you, HiveSeeker.
This report covers:
• Scope notes
• More pellet testing
• I know there’s something going on
• The Winchester trio
• RWS Diabolo Basic pellets
• RWS Hobby pellets
• H&N Match Pistol pellets
• The magic bullet? Beeman hollowpoint coated pellets
• Retesting the best
• Other military pellet rifles to consider
In Part 2, I found five pellets that would group 7/8 of an inch (0.875 inches) or better with the Winchester MP4 CO2 rifle at 10 yards (Crosman Destroyer pellets, Crosman Destroyer EX pellets (sold only in discount stores), Crosman Premier Hollowpoint pellets, H&N Finale Match Pistol pellets, and Air Arms Falcon pellets). This was about as good as I expected based on my research before purchasing this gun. However, I’d hoped that I could do better, and most of the reader comments on this blog expressed even greater concern with the mediocre accuracy of this gun than with the ammo feed problem. I’m pleased to report some slightly better news.
But first, I made a minor modification to my scope setup. I mentioned the trouble two other shooters had sighting through the Leapers UTG 3-9X32 Bug Buster scope I mounted on this rifle. I had positioned the scope for my own eye relief, and eye placement proved to be a lot more critical for this compact scope than it is with my full-sized Leapers UTG 4-16X40.
However, at least part of the difficulty they experienced may have been due to a fairly low Picatinny rail on this rifle. When the included factory scope rings loosened after 300 shots, I decided to try a different style mount and also decided to go with high-profile rings. I was surprised at how much easier it became to sight through the scope — especially since I would have thought I wasn’t having any real difficulty before. For most shooters, I believe high-profile scope rings will be the way to go on this rifle. With my new scope setup, I was ready for some final accuracy testing.
One minor note here. On Picatinny rails there’s usually a little play in the scope mounts within the individual recoil grooves, and I usually slide both my mounts forward until they contact the forward stops and then snug them up right there. This is the direction the laws of inertia demand that the scope and mounts will want to go in relation to a rifle recoiling backwards beneath them (especially pneumatic or CO2 guns with simpler recoil than a springer). If the mounts are already braced against the forward stops, then there’s less chance for them to slip. However, on the Winchester MP4, I believe the semi-auto bolt re-cocking generates some recoil in the opposite direction – this may have actually loosened my initial scope installation. This time, I braced both scope mounts against the rear stops, and they seem to be holding fast, so far. I don’t have the equipment to verify this recoil theory, but it’s something to try if you run into a similar problem.
[Editor's note: While Picatinny rails and Weaver rails both have cross slots to stop the rings from moving, Weaver slots are 3.5mm wide and Picatinny slots are 5mm wide. That's the reason for the extra slop when Weaver rings are installed on Picatinny bases. And, for airguns, the pins should touch the rear of the slots.]
More pellet testing
I continued testing with seven new pellets, shooting 10-shot, 10-yard groups outdoors from a benchrest. I shot three groups with each pellet, and reported the best of three below. With my original accuracy testing, all the pellets I tried grouped about 1 inch, give or take a little. However, this time, the groups were generally tighter — even with pellets I’d previously tested. I believe this barrel may have a break-in period — roughly 500 shots by my estimation — and is now smoothed out a little. For this test, I used digital calipers to provide more exact group measurements — though, even with my sharp eyesight and a science background, you can take that third decimal place with a grain of salt!
I know there’s something going on
There definitely seems to be something going on between the number of pellets in the rotary cylinder and accuracy. I’d already mentioned that the last two shots of my 10-shot groups, involving a magazine swap, often opened up the final grouping. Remember that the ammo mag has 8-round cylinders, so finishing off a 10-round group required switching to a cylinder with only the two final pellets loaded. I could blame the repositioning of the rifle between magazine swaps, except that this is not a problem I’ve had with rifles that require pumping or cocking and get repositioned with every shot. This time, I kept specific track of when my final two shots opened up a group, with the results illustrated below.
This batch of testing also confirmed something else I thought I’d noticed before — groups often started off very small, then opened up as I emptied the magazine. Obviously, shooting more pellets will continue to open up a grouping. What I’m saying is that shot 10 was much more likely to miss the bullseye than shot 1, rather than having a similar probability of hitting or missing it. With this semiauto, I could lock myself into a rested shooting position and do nothing but breathe and squeeze the trigger for 8 shots. Barely moving, my aim and hold were rock solid. However, I almost felt like a spectator at times as I watched pellet strikes begin to roam wider and wider around my point of aim. I believe this is the same phenomenon I observed with my final two shots of each group. My best guess is that adjacent pellets in the magazine cylinder help reduce some CO2 blow-by, or that a full magazine cylinder does not shift or flex during firing as much as an empty one.
On the left, the first three shots with Beeman coated hollowpoint pellets go into 0.261 inches, center-to-center. Keeping my fingers crossed at this point! But the fourth shot (circled) opens this group up a bit more to 0.323 inches. Six increasingly scattered shots later, the final group on the right is now even broader at 0.682 inches (that fourth shot is circled on this target as a reference point). This pattern was observed repeatedly. This was not the best example I saw. It was just the one I interrupted to photograph.
The Winchester trio
Since this is a Winchester air rifle, I felt duty-bound to put the Winchester pellets through their paces. While they were the poorest performers of all the new pellets, their best groups were all still 1 inch or less: Winchester hollowpoint pellets (0.826 inches, center-to-center), Winchester pointed pellets (0.859 inches), and Winchester round nose pellets (1.000 inches exactly). As mentioned, the Winchester hollowpoints extended past the front of the rotary cylinder when fully seated and had to be pushed back in slightly before shooting. However, they caused no jams or other firing problems.
RWS Diabolo Basic pellets
The RWS Diabolo Basic pellets yielded the next largest group of the bunch, with its best-of-three at 0.791 inches. This pellet also produced the largest group that I observed during this second round of testing — 1.324 inches.
RWS Hobby pellets
The RWS Hobby’s smallest group measured 0.644 inches. This was the best group I’d seen from this gun so far. It’s approaching the as-of-yet elusive half-inch mark, but not quite there.
H&N Match Pistol pellets
I’d tested the more expensive H&N Finale Match Pistol pellets last time, but then I read about H&N Match Pistol pellets actually outperforming the Finales in another gun I own. That’s why I ended up with a tin of these to try. At 0.716 inches, they grouped slightly better than the Finales (even with retesting, as you’ll see in a minute) in this gun, too.
The magic bullet? Beeman hollowpoint coated pellets
Okay, I’ll concede right up front that half-inch groups at 10 meters aren’t all that magical in today’s airgunning world. However, with a review quoting Daisy Customer Service as stating that MP4 owners should expect 1-1/2 inch groups at 10 meters, and with no measured groups under 1 inch reported by anybody, I was pleased to finally break the half-inch barrier with Beeman hollowpoint coated pellets.
I did not have high hopes for what is literally the cheapest pellet I tested. However, a single Pyramyd Air review mentioned it performed well (thank you, DaveTee!); and, for under five dollars a tin, it went into the shopping cart. I shot this pellet last, and it surprised me. My three test groups yielded 0.682 inches, 0.386 inches and 0.442 inches. At the eleventh hour, I’d finally found a pellet that could shoot under half an inch. While one thing that became clear during accuracy testing is that my rifle does not perform the same with specific pellets as other’s MP4s, the Beeman hollowpoint coated is definitely one to try for anyone who owns an MP4, especially at this price point.
Thar she blows — these two groups shot with Beeman hollowpoint coated pellets clock in at under half an inch, at 0.386 and 0.442 inches, left to right. (Yes, the pellets are black.) Summer sun heating the barrel on one side caused the point-of-impact shift that can be seen here.
Retesting the best
To wrap up Part 4, I wanted to retest the best-performing pellets from before, which had all grouped 7/8 of an inch (0.875 inches) or less. I was pretty sure one or two could do better, and it seemed that my rifle was starting to produce tighter groups than it had straight out of the box. These were my results: Air Arms Falcon pellets (0.622 inches, beating out the RWS Hobby pellet for second place), Crosman Destroyer EX pellets (0.630 inches, taking third place and booting the RWS Hobby pellet to fourth), Crosman Destroyer pellet (0.742 inches, just a hair better than before), and H&N Finale Match Pistol pellets (0.963 inches, actually a little wider than first time’s 0.875 inches and still getting beat out by the H&N Match Pistol pellet). A small surprise were the Crosman Premier Super Match pellets (0.707 inches) and Crosman Competition Wadcutter pellets (0.720 inches), which I used for initial sighting-in of my new scope mount setup. Both bettered their original 1-inch groups by more than a quarter inch. Again, I believe this barrel is now broken in after 500 shots or so, contributing to these tighter groups and providing better overall accuracy than we saw in the first tests.
Below is a summary of best groups one inch or better from all accuracy testing:
While discovering the Beeman hollowpoint coated doubles my effective shooting range to around 20 yards for a 1-inch target, it’s a shame that this gun seems to be a “one-shot wonder” that shoots best with only one specific pellet. From the list above, there’s no single pellet type that this gun seems to prefer as direction for additional testing, so I hope that blog readers will be kind enough to comment if they find other pellets that group under half an inch in the Winchester MP4.
Other military pellet rifles to consider
For the conclusion to my evaluation of the Winchester MP4, I’d like to mention some of the other military replica pellet rifles prospective buyers might consider if they decide that the MP4 is not for them. (BB-only rifles and machine guns are not included here.)
I’ve already mentioned the MP4′s historically older sibling, the Winchester M14. A replica of its namesake, this rifle is also a dual-CO2 canister BB and pellet semi-auto. It uses the same ammo mag and offers the same velocity as the MP4. However, it has no scope rail and many don’t like the fact that the stock is composite instead of wood.
The unquestioned dominator of the military pellet rifle arena remains the Crosman M4-177. This M4 replica is a reliable single-shot BB and pellet pneumatic and bears the coveted Gaylord “Tom’s Picks” seal in the Pyramyd Air catalog. It’s available in a variety of tan or black color and accessory combinations. The new Crosman USMC MOS 0311 Rifleman (an exclusive Crosman variation of the M4-177) appears to be another variant of this very popular replica. This is the gun I had in mind when I mentioned that more accurate rifles than the Winchester MP4 are available for half the price.
The Crosman MK-177 is a replica of the Magpul Masada (now being produced as the FN SCAR). This composite-stock pneumatic offers higher velocity and similar accuracy to the M4-177 (also beating the Winchester MP4 in the latter department, and for half the price). This rifle is a BB and pellet single-shot. B.B. Pelletier recently used the MK-177 to test the Leapers Accushot Scout Scope. While many disparage the bolt placement on the left side of the receiver, I own — and love — one of these rifles and never minded it (this is a replica — check on which side the bolt is actually located on the Magpul Masada). The MK-177 is available in tan or black and has two kit variations.
The Crosman Crosman MTR77NP is an M16 replica that is a single-shot Nitro Piston gas springer. This pellet rifle offers the highest velocity of any of these military replicas but requires heavy cocking effort due to the short barrel. It’s available in only black but comes in open-sight or scoped versions.
If you actually own an AR/M4 firearm, the Crosman MAR177 AR-15 Upper PCP conversion kit replaces the firearm upper with a .177-caliber competition precharged pneumatic unit. Designed specifically for 10-meter competition, velocity is a very nominal 600 fps. This is the most expensive option for a military pellet rifle (and a significant detour from the standalone guns listed here), but it seems like an ideal way to expand where and when you can shoot your military long gun.
The Beretta CX-4 Storm is an 88-gram CO2-powered replica of the tactical firearm of the same name. This semiauto’s claim to fame is the 30-pellet belt magazine, capable of ripping through a tin of pellets in no time. Open-sight and red-dot versions are available, though a scope can be mounted on the Picatinny rail.
The Gamo MP9 copies the B&T MP-9 9mm SMG and is unique among the CO2-powered BB submachine guns in handling pellets as well. Interestingly, this gun is listed as using the same ammunition magazine as the Winchester MP4 and M14, making it a 16-shot semi-auto (with the magazine flip). I included this odd-gun-out because it has a (collapsible) stock and scopeable Picatinny/Weaver rail.
The options for new military replica pellet rifles are very limited at the moment. I hope that this blog has sufficiently informed readers about the Winchester MP4 to make an educated choice if buying one – or to achieve the best performance from their rifle if they already own one. I also hope that manufacturers will look to success stories like the Crosman M4-177 as well as the burgeoning airsoft market and bring some novel products to this mostly unexplored marketplace.
Editor’s final comment: HiveSeeker has done a super job in testing, researching and documenting his work on the Winchester MP4. I think his report will stand as the best article written about the airgun for a long time.
by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
This report covers:
• Doing something different
• Tightened the barrel joint
• Sight-in and the first group with Hobby pellets
• Air Arms Falcon pellets
• RWS Superdome pellets
• H&N Baracuda Match pellets
• JSB Exact Express pellets
• Crosman Premier 7.9-grain pellets
• Alternate hold
I started this test in July but have laid off for several weeks. Thanks for bearing with me. Today, we’ll look at the accuracy of the Ruger Airhawk combo at 10 meters.
I’m looking at this combo because a number of readers say they really like the rifle. Of course, it’s been compared to an RWS Diana 34, but I wouldn’t go that far. Yes, there are similarities between the two rifles, but they’re not identical. And each has its own unique firing characteristics – and we’ll all learn a lot about those as I fire the rifle for accuracy using the open sights.
If this rifle proves to be accurate, it’ll be a best buy, given the price of just $130. I know my test rifle is shooting slower than the advertised velocity, but I plan on testing the velocity, again, after the accuracy test, so don’t give up just yet.
Doing something different
I’m changing the way I test air rifles in an attempt to make some progress faster than in the past. I’ll shoot just 5 shots at 10 meters off a rest with each pellet and then look at the group. If the group shows promise, I will come back to the pellet. If not, I’ll move on. That way, I’ll be able to test more pellets in the same time.
I’ll also test at least 2 different variations of the artillery hold — the 2 that have proven the most successful over the years. If one seems better than the other, I’ll continue to use that hold for all the other tests.
Tightened the barrel joint
I noticed last time that the barrel joint wasn’t tight. This barrel has a bolt that can be tightened, so I removed the action from the stock and tightened the barrel pivot bolt. When I was doing that, I noticed that all of them were loose. The inletting of the action in the stock was very tight — fully the equal of anything made in Europe. That gives me hope this rifle will be accurate.
Sight-in and the first group with Hobby pellets
I sighted-in the gun and shot the first group with RWS Hobby pellets. Sight-in amounted to just one shot that told me the rifle was on target from the factory.
I’m showing the sight-in shot along with the first group for two reasons. First, it shows how low the first shot was, yet I knew I’d be okay because I was shooting from just 12 feet. I knew the group would hit the paper higher. Second, it shows how much the shots climbed on target when I shot from 10 meters. This lesson demonstrates that you cannot sight-in a gun for anything under 10 yards and expect it to be on at any other distance. Even 10 meters is too close to sight-in a rifle if you expect to ever hit things at 15 yards and beyond. The sights are too close to the target, and the angular separation from the bore is too great when you’re this close.
I held the rifle on the flat of my off hand with the triggerguard touching the heel of that hand. The group of 5 Hobbys measures 0.678 inches between centers. This is too large for a 10-meter group, so Hobbys are out of consideration.
After this group, I adjusted the rear sight 7 clicks to the left but didn’t touch the elevation. The sight remained in that setting for the rest of this test.
Air Arms Falcon pellets
Next, I tried Air Arms Falcon pellets. Falcons hit the target well-centered but much lower than the Hobbys. Five pellets went into a group that measures 0.493 inches between centers. While that isn’t as good as I’d like to see at 10 meters, it does show some promise. I’ll probably shoot Falcons from 25 yards, as well.
RWS Superdome pellets
Next, I tried RWS Superdomes. They gave me a puzzling result. Four of the 5 pellets went into 0.506 inches, but the final shot opened the group to 0.906 inches. That might have been an aiming error; but at 10 meters, I usually don’t make mistakes that large. I might try these again, but not if I find 2 other pellets that are better.
H&N Baracuda Match pellets
Next, I shot 5 H&N Baracuda Match pellets. Sometimes these pellets that seem too heavy for a gun will surprise you with their accuracy, although I have to say that happens more with heavy .22-caliber pellets than with .177s. It certainly didn’t happen this time. Five Baracuda Match went into 1.372 inches. Although 3 pellets are close, I don’t think this pellet is right for this rifle.
JSB Exact Express pellets
Five JSB Exact Express pellets were next. I have to confess that, while I like JSB pellets a lot, I’ve never had any luck with the Express pellet in either caliber. Today was no different. Five went into a 1.466-inch group that proved to be the largest of the test. Definitely out of the running for this rifle!
Crosman Premier 7.9-grain pellets
I felt I had to try the 7.9-grain Crosman Premier pellet that’s often the best in some rifles. And I got an interesting result. The first pellet hit the target high and near the center of the bull. Then the next 4 dropped over one inch and grouped in 0.411 inches.
This group is small enough to interest me, so I shot a second group of 10 pellets. They landed in 0.746 inches, which is okay, but not the best. However, if you look at the group, you can see that 6 of the 10 pellets went into a much tighter group that’s a single hole measuring 0.357 inches between centers. I know that aiming errors can put me off by as much as these 4 outlying pellets at 10 meters, so this group gives me confidence that the Airhawk can really shoot.
I then tried the same Premier lite pellets with my off hand slid forward so I could feel the beginning of the cocking slot against my palm. Now that I know this is a good pellet, I can try different things like this. Five pellets went into 0.852 inches, which isn’t good — but look where 3 of them went! That hole is a group measuring 0.069 inches! I don’t think that was due to the different hold, but I do think it tells me this rifle can really shoot and that the Premier lite pellet is right for this gun.
Using an alternate artillery hold, 5 Premier lites went into 0.852 inches. While that isn’t so good, 3 of those pellets went into 0.069 inches. I think the rifle can shoot, and this pellet is the right one – but the first hold is best.
Edith spotted the fact that I may have skewed the test results by not seasoning the barrel for each pellet. I guess that’s the down side of shooting so many 5-shot groups. It does bring up a good point. I think that when I move back to 25 yards, I’ll season the barrel with 20 shots per pellet before shooting the first 10-shot group.
She also suggested that I do a seasoned barrel vs. unseasoned barrel accuracy test. There are enough of you who believe in the seasoning process, so that makes such a test worth the effort.
by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
Today’s report is the start of a guest blog from airgunner and blog reader Fred_BR from Brazil. He’s going to tell us about a breakbarrel spring-piston air rifle he recently acquired. It’s a civilian copy of a scarce military trainer.
If you’d like to write a guest post for this blog, please email me.
Over to you, Fred.
This report covers:
• FAL in the Brazilian army
• FAC: Fuzil de Ar Comprimido
• My Model Sport 82
Rossi Sport 82
Today, I’ll show you an old rifle that I believe most of you have never seen: the Brazilian-made Rossi Model Sport 82. It is a civilian version of a military training rifle used by the Brazilian army to train recruits before letting them handle the firearm – the FN-FAL 7.62 NATO battle rifle.
FAL in the Brazilian army
In 1964, the Brazilian army adopted the FN FAL 7.62X51mm (.308 Winchester) battle rifle as a replacement for the old bolt-action Mauser rifles then in use. IMBEL, the Brazilian Government arsenal, acquired the rights to produce a local version of the firearm, eventually making 250,000 of them according to some sources. The FAL proved to be a very sound choice, and to this day it’s the preferred rifle of many military and police elite units. For recruits, however, the FAL is not exactly easy to master, especially for inexperienced hands.
The Brazilian army approached Amadeo Rossi S/A and asked for a version of their standard air rifle to mimic the FN FAL. Rossi, a Brazilian manufacturer well known to American shooters for its line of budget-priced revolvers, is also a traditional maker of popular air rifles, mostly inexpensive and very simple in design — but well built.
The response from Rossi was a breakbarrel spring-piston rifle with a redesigned stock that has a pistol grip, a false magazine, and front and rear metallic sights that copy those of the FAL. Lead inserts would bring the weight close to that of the standard FAL rifle. Even the carry handle was included. Caliber was .177, the only airgun caliber then available in Brazil.
The Sport 82 is a civilian version of the military FAC, or compressed air rifle, used by the Brazilian army for training.
[Editor's note: Many countries do not permit former military weapons or even airguns to be sold to civilians. They feel it promotes theft, which it certainly does. Some countries don't even allow civilians to use firearms chambered for military cartridges for the same reason.]
FAC: Fuzil de Ar Comprimido
The resulting gun would be adopted as the “FAC – Fuzil de Ar Comprimido,” Portuguese for “compressed air rifle,” a nickname sufficiently close to “FAL” to satisfy the officers. The rifle would be the initial introduction of recruits to shooting, before being allowed to use the firearm.
Rossi would sell this rifle to civilians with some modifications. Some say they were obliged to do so because of military restrictions, others say they modified the rifle to become more acceptable to young shooters — then the only market for airguns in Brazil. Rossi may have realized that no kid in their early teens would buy such a heavy rifle and made it lighter and without the false magazine and carry handle, but keeping the FAL-style sights. This model would be released to the shooting public in Brazil as the Model Sport 82.
My Model Sport 82
I searched for an example of this rifle after B.B.’s post on the Egyptian Hakim airgun. It didn’t take me long to find one. The gun is a spring-piston, breakbarrel rifle with 13.60 inches of barrel length, 38 inches overall, weighs 5 lb., 4 oz., and has a 15-inch length of pull. The stock is made of black-painted wood, and features a pistol grip and general style that basically copies the grip and stock of a standard fixed-stock FAL, although some models were sold with the natural color of wood. Later models would be equipped with barrel-mounted open sights, but my rifle has the FAL-style peep sights regulated for height and windage via two screws.
The front sight is a simple post protected by two ears like the FAL and located closer to the breech than on most airguns
The rear sight is an aperture adjusted for height and windage by two screws. It’s mounted on top of a wood extension to fit the FAL-sized stock.
The spring-piston tube assembly is very short, almost junior-sized. To meet the FAL-lookalike specs required by the army, Rossi added an extension behind the rear portion of the spring tube, apparently also made of wood, just to keep the action from being too short in the long stock made for this model. Keep in mind, fellow readers, that airguns made back then in Brazil were mostly considered youth rifles not intended for adults at all, so they were mostly compact and lightweight models. The gun has no safety of any kind, so it relies on good handling to avoid accidental discharges.
The breakbarrel action is very smooth and easy to cock, as a good youth models needs to be. The short-stroke spring-piston rifle can push pellets in the 450 f.p.s. to 480 f.p.s. range. This is sufficient for most applications of such a training airgun. That’s the good news.
Now for the bad news: The trigger is horrendously heavy. I couldn’t even measure the trigger weight. I can only tell you that this gun sports the heaviest trigger I’ve ever encountered on any rifle — airgun or firearm. The thing is so difficult to pull that, after a few shots, I was feeling pain in my trigger finger. It definitely took the fun out of the equation pretty quickly. As the gun has no safety, I can only think this was Rossi’s way of preventing an accidental discharge by making the trigger so heavy that kids wouldn’t pull it unintentionally. Well, I almost could not pull that thing even on purpose!
I would love to show you lots of pictures of very tight groups made with the Rossi 82, but the best I could do was a mere 1.25 inches at 10 meters with this gun. I blame the trigger for that, and I plan to disassemble the gun to check the exact condition of its trigger and sear. Maybe some careful trigger work will improve it.
Except for the trigger, the Sport 82 is a lightweight, easy-to-cock carbine with a distinguished look that sets it apart from other air rifles. It has a history of service to my country, training civilians and military recruits, and doing its job gallantly. To this day, the Brazilian army still introduces safe gun handling to trainees using the FAC.
by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
Crosman 2240 conversion to air: Part 3
Crosman 2240 conversion to air: Part 2
Crosman 2240 conversion to air: Part 1
R.A.I. Adjustable AR Adapter for Crosman 2240 pistols: Part 2
R.A.I. Adjustable AR Adapter for Crosman 2240 pistols: Part 1
WARNING: This conversion changes the operation of the pistol to use air at up to three times the pressure it was designed for. The parts that are installed are strong, but there are other parts in the gun that aren’t changed and could fail when subjected to the higher pressures. Pyramyd Air advises anyone making such a conversion to exercise extreme caution.
This report covers:
• Sight-in at 12 feet
• Back to 25 yards
• End of the test
• Ft. Worth airgun show update
• Boot Campaign
Today, we’ll look at the accuracy of the 2240 on air at 25 yards. I’ve installed a 14.50-inch Crosman barrel on the gun, which boosted the velocity, as we saw last time. It also may have boosted the accuracy. Let’s find out.
The UTG Pro 6-Position Adjustable Stock has been remounted using the R.A.I. adapter. So, this is now a handy carbine.
I’m filling the pistol to 2250 psi, because I learned that was necessary when using the factory valve and a heavier striker spring. I get exactly 10 good shots per fill, which works well with my 10-shot groups.
For a sight, I installed the Tech Force TF90 dot sight that was used to test the Hakim rifle at 25 yards. We saw in that report how well this sight works, so it should work just as well on this carbine-sized gun I’ve assembled.
I sighted-in with 5 shots at 12 feet, and the gun was ready to shoot at 25 yards. I’ll show the sight-in target and explain it, so you can understand how this close sight-in works.
Sight-in at 12 feet
I sight-in at 12 feet because it’s safer. I know I’ll be on paper that close to the target, and I also know where the pellet needs to strike to be on at 20 yards. I used to sight-in all the rifles we sold at AirForce Airguns this way and was always on-target when I backed up to 23 yards. To learn more about this method, read this article.
What I’m looking for is the pellet landing in line (left and right) with the center of the bull, but as far below the center as the center of the sight is above the center of the bore. In other words, if you were to walk up to the target until the muzzle was touching the paper and center the dot (in this case) on the bull, where would the pellet strike the paper?
When you’re 10-12 feet back, the impact point doesn’t change much from that. But when you back up to 20 yards (20-30 yards, actually) the pellet rises up on the paper and ends up close to the aim point. It isn’t exact, but it’s the fastest way that I know to sight-in a pellet rifle.
My sight-in pellets were hitting the target a bit high, but not too high. Once they were centered, I left the sight where it was set and just backed up. I sighted-in with Crosman Premiers.
The first 3 pellets hit to the left of center. I adjusted the sight, and shot 4 hit to the right of center. I adjusted back to the left, and shot 5 was close to center. These are hitting too high at 12 feet, but I’ll use the setting as it is.
Back to 25 yards
The first group was fired with 14.3-grain Crosman Premier pellets. The first 3 pellets hit high and right of center. I don’t know how the rest of them hit, but you can see this is a fairly well-centered group of 10 shots. It measures 0.918 inches between centers, which isn’t too bad for a small gun like this at 25 yards. Remember — I’m shooting 10 shots instead of only 5.
Again, I must comment how nice and clear the TF90 sight is. It really holds a tight group – even though the target appears very small. That makes it a confidence-builder.
Next, I tried the JSB Exact Jumbo RS pellet. These often do well in lower-powered airguns. Remarkably, they went to the same point of impact as the Premiers. That means I don’t have to change the sight settings when using either pellet. This time, 10 RS pellets made a 0.763-inch group! That was very good, I thought. Especially given that I was using a dot sight!
End of the test
I’d planned on trying Beeman Devastator pellets next; but when I filled the gun, I noticed a leak at the joint of the HiPAC tank and the pistol’s tube. It was a fast leak and obviously the o-ring wasn’t doing its job. I tried oiling the gun with silicone chamber oil and refilling it, but the leak didn’t stop. So the test was over. I have to find out the problem and fix it if I can.
I do note that the pistol leaked down to 1750 psi and stopped. When I refilled it, the leak was much slower, so the oil may have done something. I think the o-ring and groove need to be cleaned and the tank installed again. But we’ll see.
At any rate, today’s test shows promising accuracy. It may not have been complete, but I’ll return to test the gun again at 25 yards. I plan to mount the TF90 on the Crosman 1077 next, so it may be a while before I get back to the 2240.
Ft. Worth airgun show update
The hotel is filling up fast for the show. Don’t forget to come to the reception at the hotel even if you aren’t staying there. It will be 7 p.m. to 8:30 p.m. Friday evening. Nothing fancy — just a chance to meet and talk about airguns before we set up Saturday morning.
I’ll be taking a caravan of people out to the range Friday afternoon from the hotel at 4 p.m. The range will be open earlier for people who want to get out there by themselves, but please tell me you are going, because this range is private. They need to know you’re coming or the gate will be locked.
We plan to start the door prize and raffle drawings very early after the show opens, and they’ll be held periodically throughout the day. Get there early and buy your raffle tickets for a chance to win a Walther LGV Competition Ultra, an AirForce Airguns CondorSS or a Hatsan AT44-10 Long QE! Since this show will probably not top a thousand attendees, you’ll have a real chance to win one of these fabulous rifles. And everyone who pays admission gets a chance to win an Air Venturi Bronco and a Benjamin Trail NP2 door prize!
Another group coming to the show is the Boot Campaign — a Texas-based nonprofit organization dedicated to the military (past and present) and their families — cultivating awareness, promoting patriotism and providing assistance.
Also, American Airgunner TV host Rossi Morreale will be attending the show, as he’s interviewing the ladies from the Boot Campaign.
I’ll have more news about the show as it develops.
Winchester MP4 CO2 rifle: Part 3
by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
Today’s report is a continuation of the guest blog from HiveSeeker. Today, he tells us about the rifle’s performance.
If you’d like to write a guest post for this blog, please email me.
Over to you, HiveSeeker.
Daisy’s Winchester MP4 is a realistic and fun-to-shoot military replica pellet rifle.
This is the third installment in my evaluation of the Winchester MP4 CO2 rifle. The short version of Parts 1 and Part 2 is that this gun might be of interest to someone looking for a realistic AR15-style semiauto pellet rifle — as long as they can accept 1-inch, 10-yard groups and an intermittent ammo feed problem. I was determined to find out what was causing the ammo feed issue in order to minimize or eliminate it and was also certain the gun could shoot tighter groups with more testing. In Part 3 and also in Part 4, I make progress on both fronts.
This report covers:
• The ammo feed problem
• Testing the ammunition magazine
• It’s the CO2 clip!
• Eliminating minor misfires
Before we continue, I want to add a couple comments that should have been included previously. First, in addition to the authentic realism of this replica gun, at 5.8 lbs., it hefts like a firearm. Most of the other military-style pellet rifles out there are lighter, and a number of reviewers mention that the realistic weight of the Winchester MP4 adds to its appeal. I agree.
Second (and B.B. was kind enough not to chide me for this), I failed to mention that despite the manual’s statement that no additional lubrication is needed for this gun once it leaves the factory, go ahead and put a drop of Crosman Pellgunoil on the tip of each CO2 cylinder when you install it. That will help keep all those seals healthy and happy for years to come.
The ammo feed problem
I hadn’t experienced the MP4′s ammo feed problems to nearly the extent of some other shooters, but I was determined to figure out the possible causes and eliminate or minimize them. I suspected that the problem might be related to either the ammunition magazine (which has an 8-shot rotary cylinder on each end where the pellets or BBs are loaded), or the CO2 clip (which holds the two CO2 cartridges). I already had a number of spare magazines and ordered six additional CO2 clips directly from Daisy Customer Service for testing.
Two ammunition magazines on the left. They have 8-shot rotary cylinders on each end that hold the pellets or BBs. On the right are two CO2 clips that hold the CO2 cartridges. The ammo mag slides into it. Keep all these terms straight for the discussion below! That little plastic CO2 piercing key fits neatly into the slot at the bottom of the CO2 clip cover.
Testing the ammunition magazine
While I initially suspected the ammunition magazines were the source of inaccuracy, one curious fact is that these are the same ones used by the Winchester M14 and they apparently work flawlessly in that gun. It got 14 out of 15 five-star reviews at Pyramyd Air. We’ll come back to the ammunition magazine in a moment, but suffice to say that I ended up testing 9 different ammo mags in each of 7 different CO2 clips and found no difference in their performance. None of the ammo mags were malfunctioning.
It’s the CO2 clip!
The CO2 clips proved to be another story. When they arrived from Daisy, they were all in excellent condition, but it was clear that two of them had been used. When I inquired, I was told that not enough new CO2 clips were available, so two units were pulled from returned MP4s. This is not encouraging, but they were much cheaper than expected, so I had no complaints. I marked all 7 of my CO2 clips and got ready to test the new arrivals. Clip 1 is the already-tested original that came with my rifle.
The first shot using clip 2 (the first of the 2 used clips) was a major flyer, zinging well off my point of aim. Not an auspicious start. Second shot, no pellet — just air (which I’ve been calling a misfire and one of the few ammo feed issues I’ve actually experienced up to this point). The third shot was my very first jam with this gun. The ammunition magazine would not eject from the CO2 clip, and I had to eject the CO2 clip itself to get the ammo mag loose.
I was especially careful to reseat the CO2 clip solidly for my next try. Fourth shot was another flyer but not quite as bad as the first. Fifth shot was another jam. This one was worse than the first, with the trigger jammed solid and the ammo mag again not ejecting. This time when I ejected the CO2 clip, the ammo mag actually stayed lodged inside the receiver!
It was suddenly clear what had happened — a pellet was jammed halfway between the ammo mag’s rotary cylinder and the barrel, locking the ammo mag in place. Fortunately, I had a plastic rod for clearing jams. Sure enough, I could feel the pellet slide back a little and then the ammo mag simply fell out of the gun.
When I examined the magazine, both the noses and skirts of several of the pellets showed visible deformation. This was the first time I’d really experienced the frustration of other MP4 buyers who had ended up returning their guns. I’d had enough — I was done testing clip 2! (Note that Daisy Customer Service replaced this clip with a brand new one at no charge.)
This is what a bad CO2 clip does. This jam was so bad that the ammunition magazine remained lodged inside the receiver even after the CO2 clip was ejected. Note the damage to the two pellet skirts, especially the one on the right.
With no small amount of trepidation, I shot a full magazine using original clip 1, just to make sure my gun had not been damaged. Thankfully, everything was back to normal.
I was ready to test CO2 clip 3 — the other used one. Except for being a little tight in the receiver (something I’d also noted with my original clip), it performed flawlessly with all 9 ammunition magazines. I did have to push harder for the ammo mags to click into place, but that was all — and this actually smoothed out by the time I was finished testing. My experience was identical with the remaining brand-new CO2 clips 4 through 7. They varied in how tightly they fit into the receiver and how tightly ammunition magazines fit inside them, but they smoothed out with just a little use. And after hundreds of pellets, I had only a few misfires, which I subsequently decided were my own fault.
Here’s my important finding: The worst ammo feed problems are probably being caused by bad CO2 clips. Either the CO2 clip itself is not seating correctly within the receiver, or ammunition magazines are not seating correctly inside the CO2 clip. Either will cause the pellet not to line up with the barrel, resulting in a jam or misfire. This also explains why the identical ammunition magazine performs flawlessly in the Winchester M14 (where it locks directly into the receiver) but suddenly starts having problems in the MP4.
The obvious conclusion is that a replacement CO2 clip just might fix a misfiring MP4. If you order one directly from Daisy, try to make sure you’re getting a brand-new one, as these performed flawlessly – though I only had trouble with one of the two used clips. Note: To add to the nomenclature confusion, if you order this part from Daisy Customer Service, both they and the exploded parts diagram refer to the CO2 clip as the “Puncture Unit” (Part 79).
We’ll take a minor detour as long as we have the MP4 parts diagram up. A number of reviews and blog comments describe the MP4 as a dressed-up Winchester M14. I initially thought otherwise, but the schematics prove me wrong. The barrel assembly and many other internal components appear identical. The CO2 clips share many parts as well. However, in the M14, the ammunition magazine slides freely through a hole in the CO2 clip and locks directly into the receiver. In the MP4, the ammo mag latches to the CO2 clip, which then latches into the receiver. As we’ve seen, having a middleman (the CO2 clip) between the ammo mag and the receiver is a potential problem. Besides the CO2 clip, the biggest differences between the M14 and the MP4 lie in the trigger mechanisms, receivers, and stocks and forearms.
The Winchester M14 does, indeed, share many parts with the MP4.
These are Winchester M14 CO2 Clips. The ammunition magazine slides freely through a hole in the CO2 clip (circled) but does not click into it. Instead, the ammo mag locks directly into the receiver — no middleman here! An ammo mag is shown inserted into the hole in the clip on right. This CO2 clip can be misaligned with the M14’s receiver without affecting ammo mag alignment at all.
Back to the MP4. One Pyramyd Air review suggests that the ammo mag misalignment may be caused by CO2 pressure pushing the CO2 clip slightly out of position. This is certainly plausible and might also explain why this problem can worsen over time (as other reviews report) if increasing wear is occurring. If wear is occurring on the CO2 clip, a replacement CO2 clip could fix the problem. If wear is occurring inside the receiver — or should something actually be wrong with the receiver to begin with — then it’s time to contact the manufacturer or start picking out a new rifle.
I ended up content with the fact that one of my new CO2 clips was not working (again, Daisy Customer Service sent a free replacement). Otherwise, I would still be scratching my head about what could be causing the more severe ammo problems I’ve been reading about. The fortunate bottom line is that this provides a likely fix for people with MP4s that are misfiring or jamming. Order a replacement CO2 clip from Daisy or Winchester Customer Service and see if that doesn’t remedy the problem.
Eliminating minor misfires
Although I never experienced a major ammo problem or jam, except while testing CO2 clip 2, I was still having minor misfires (firing a blank or a skipped pellet left in the ammunition magazine when done shooting). This was occurring about once every one or two magazines (or once every 16 to 32 shots if you’re counting — roughly 5% of the time). I wanted to eliminate this if I could. When I contacted Daisy Customer Service to order the extra CO2 clips, I inquired about this. While the Daisy rep did not acknowledge a known ammo feed issue with the MP4, I not only received some suggestions over the phone, but a follow-up email with additional information, as well.
Except for testing CO2 clip 2, all of my own ammo feed problems were limited to infrequent misfires (blank shots) and an occasional skipped pellet that remained in a supposedly empty ammunition magazine.
Daisy cautions that you should use good-fitting (tight) pellets and make sure they’re seated all the way. This will prevent pellets from backing out of the magazine (more specifically the rotary cylinder), causing a jam. I’ve been using a Pellet Pen with Pellet Seater for loading, and the advice makes sense. However, none of the pellets I tested were loose, and most actually fit quite tightly. Ironically, the only pellet that caused a problem was Winchester’s own hollowpoint, which stuck out the front of the cylinder (even when fully seated) just enough to interfere with the cylinder’s rotation. I simply pushed the pellet noses back in slightly and didn’t experience any misfires during subsequent accuracy testing.
Despite how tightly most pellets fit, however, if I pulled an ammo mag that still had pellets in it I sometimes noticed that pellets I had seated all the way into the cylinder were loose and pushed back a little. On one occasion, I actually had a loosened pellet fall backwards right out of the magazine. I could not determine what might actually be pushing pellets backwards in their cylinder cavities, but my first guess is that CO2 bypass somewhere must be exerting pressure on the front of the pellets. The gun’s mild recoil (or possibly the bolt recocking action) might be another possibility. Whatever the cause, once this happens previously stopper-tight pellets will slide easily in the cylinder. As far as I could determine, though, pellet fit was not a problem in my gun. And it was not the problem for Pyramyd Air reviewers who tried a range of pellets with all kinds of persistent problems, either – that was probably the CO2 clip.
Daisy’s other – and I think more relevant – suggestion was to shoot slower, allowing 3-5 seconds between shots to let the CO2 cartridges recover. My first thought was that this takes away a lot of the fun of a semi-auto. This specific feature was one of the reasons I’d purchased the MP4 to begin with. Of course, the first thing my wife did as soon as she got her hands on my new gun was see how fast she could make me work the reset cord on our knockdown target. Sure enough, she had a skipped pellet in the magazine following her quick-fire volley. That’s not quite fun.
My second thought, in the form of a tiny bell ringing in the back of my mind, was that during my chronograph tests when I was waiting a full minute between shots, I didn’t have a single misfire for almost 150 rounds. I thought this was an anomaly, but it wasn’t!
With this advice in hand, I continued my testing, making a point to take time to breathe several times between shots. Lo and behold, I went through nearly 600 pellets with only 4 misfires, and I believe I actually caused these. Two of the misfires were from shooting fast during some other testing, and the other two are discussed below. Slowing down my shooting has essentially eliminated all my misfires—though I’m not having quite as much fun with the semi-auto MP4 as I was before.
Now, as to those final two misfires. After ejecting a supposedly empty ammunition magazine and discovering a skipped pellet still present, I remembered that on one shot I’d partially depressed the trigger, run out of “breath” before I was ready to shoot and released the trigger for another try. When I later removed the CO2 clip, I inverted the gun and squinted down into the receiver. As I squeezed the trigger, sure enough, I saw the catch that indexes the rotary cylinder move. So, squeezing the trigger indexes the ammo mag cylinder, and I’d inadvertently rotated a pellet out of queue, causing a skipped pellet. This revelation occurred early in my latest round of testing, and I continued shooting with steady, deliberate trigger pulls after that (and tried to make sure I didn’t run out of “breath” again). This also means that you should fully release the trigger between shots, though this was not a problem for me as far as I could tell. More deliberate trigger work, along with slower pacing between shots, has resulted in no more misfires so far.
This rectangular catch (shown by the large arrow) just under the breech indexes the rotary cylinder on the ammunition magazine when the trigger is pulled. The inset photo and small arrow show the ratchet teeth on the rotary cylinder that the catch engages. A false start on a trigger pull can rotate the cylinder without actually firing, causing a pellet to be skipped in the firing sequence.
In summary, misaligned CO2 clips appear to be causing the most severe ammo feed problems in the Winchester MP4, and a replacement CO2 clip should get a malfunctioning MP4 working correctly. Tight-fitting pellets, slower shooting and more deliberate trigger pulls can eliminate minor misfires; but these require additional time and concentration and take some of the fun out of shooting this semi-auto. While I really like the Winchester MP4 and continue to enjoy shooting it, I’m having to jump through hoops to make it work properly, which is something prospective owners need to consider.
In Part 4, I’ll complete my accuracy testing (and finally break the half-inch barrier) and wrap up my evaluation.