Posts Tagged ‘Reaxis gas piston’
by Tom Gaylord, a.k.a. B.B. Pelletier
Just a word
Befoere I get started with today’s report, I want to say something about what happened this weekend. Friday’s airsoft report got a lot of comments. Among them are several questions about the technology of the guns. And some admissions that people didn’t think much of airsoft before they tried it, then they found their opinions changed drastically. That also happened to me, so I can relate to it.
But all you who don’t care for the subject don’t need to worry. This isn’t going to become an airsoft blog. I will continue to report on it at a low level, but I know this is an airgun blog, and that’s not going to change. I want to assure the readers for whom the subject of airsoft is not welcome that we are still going to talk about pellet guns and BBs guns for the most part. I will write a few reports on airsoft now and then, and I trust they won’t upset you too much.
Okay, that’s done. On to the topic of the day!
Today is our second look at the .22-caliber Octane combo from Umarex, and it’s velocity day. Before I get to that, there are a couple adjustments I wanted to make to the rifle. Let’s look at those now.
The first adjustment is the trigger. In the first report, I said the trigger is crisp but heavy. The adjustment screw adjusts only the length of the first-stage pull; so I adjusted it to be longer, and stage 2 decreased. Don’t go too far or the rifle will not cock at all because this adjustment does affect the area of sear contact.
I did go too far and had to call Umarex USA, where I learned that the Octane is supposed to come with a warning tag telling you not to turn in the adjustment screw more than one full turn. I went way past that, so all I had to do was turn the screw back out until the head stood even with the trigger blade — and the trigger was back to working again. For even greater contact, turn the screw so it stands proud of the trigger blade.
The second thing I wanted to adjust is the tension on the action forks because the barrel pivot was too loose. To do that, I normally take the barreled action out of the stock. But with this rifle, you need to be aware that the pins in the trigger are not held in and will fall out of the trigger if the action is tipped sideways. I didn’t know this, of course; and when the first pin fell out, it set me up for 45 minutes of work to get the trigger back together again. It seems that the trigger pins are held in place by the stock. Other airguns I’ve worked on have the same arrangement, and one solution is to put tape on one side of the trigger to hold the pins in place…and keep the trigger oriented straight up and down.
Each of the 6 free (not held by circlips or springs) trigger pins seen here is very loose in its hole and will fall out of the trigger if the gun is jostled or tipped to the side. They’re held in place by the stock. What appears to be a pin at the far right is actually a rivet.
Better still — what you can do (VERY CAREFULLY!) is remove both forearm screws and just LOOSEN the rear screw behind the triggerguard. Then the front of the action can be tipped up clear of the stock far enough to tighten the barrel pivot bolt and nut. I would advise against taking the action completely out of the stock. If you do, know how loose the trigger pins are and treat the rifle accordingly. When the pins fall out, the internal trigger parts start moving around. They’re fairly easy to align with their pin holes, except for the safety that takes a little fiddling since it’s a 2-piece assembly with an internal pivot. My advice is to leave the gun in the stock.
One final tip. When you tighten the stock screws, don’t tighten the rear stock screw (the one behind the triggerguard) too much or the trigger won’t function. It was not tight when I first took the action out of the stock; and I found that if I tightened it too much, the trigger would not work. Umarex told me the screw shouldn’t affect the trigger at all, but I’m just reporting on the behavior of my test rifle.
Now, let’s look at the velocity of the Octane. I’ve selected 3 popular lead pellets and one lead-free pellet.
JSB Exact Jumbo
The first pellet I tested was the 15.9-grain JSB Exact Jumbo. This is a popular and very accurate pellet in many airguns, and I think it may be accurate in the Octane. This pellet averaged 762 f.p.s. in the Octane. The low was 748 f.p.s., and the high was 787 f.p.s.; so the spread was 39 f.p.s. At the average velocity, this pellet produced 20.51 foot-pounds of muzzle energy.
This pellet loaded easily, perhaps too easily. I think it might be a little undersized for the Octane’s breech. That could affect the accuracy. We’ll see.
The RWS Hobby pellet weighs 11.9 grains in .22 caliber and is very tight in the Octane’s breech. It averaged 889 f.p.s. in the rifle with a low of 867 and a high of 902 f.p.s. So the spread was 35 f.p.s. At the average velocity, this pellet produces 20.89 foot-pounds of energy at the muzzle.
I don’t know how Hobbys will do in the Octane, but I suspect they’ll do well because of the tight fit in the bore. Of course, the Hobby is a wadcutter, so accuracy will fall off after about 25 yards.
The .22-caliber Beeman Kodiak dome weighs 21.14 grains, which makes it a very heavy pellet. In the Octane, Kodiaks averaged 682 f.p.s. with a range from 665 to 691 f.p.s. That’s a total spread of 26 f.p.s. At the maximum velocity, the Kodiak produces 21.84 foot-pounds at the muzzle.
My guess is that the Kodiak pellet might also be a good one for the Octane. If so, that’s great because it also produces the most energy of all the lead pellets tested.
Okay, the name of the game with pellet rifles these days is speed, and the RWS HyperMAX lead-free pellet at 9.9 grains is the way to get it. In the Octane, they averaged 1029 f.p.s. with a spread from 1022 to 1075 f.p.s. That’s a spread of 53 f.p.s., so the rifle is probably still burning a lot of fuel. At the average velocity, the HyperMAX pellet produced 23.28 foot-pounds of energy at the muzzle.
The HyperMAX pellet fit the breech very loosely. That’s probably where the extra velocity spread came from, as more dieseling was generated by less pellet resistance. I doubt this pellet will do very well in the Octane because of the loose fit.
The rifle recoils noticeably in both directions, but there’s no vibration, whatsoever. Nearly all rifles with gas springs have a sharp buzz that hits you in the cheek, but the Octane doesn’t. In fact, aside from the recoil, it’s a very smooth-shooting spring rifle.
Remember that I had to adjust the trigger for a very definite stage-2 let-off. That affected the trigger-pull a lot. I was able to adjust it back to a release of 7 lbs., 14 oz. with very little creep. It’s heavy, as I noted before, but I think it’s crisp enough to do good work. We shall soon see!
The Octane IS NOT LOUD!
When I first tested the rifle it was very loud. And the sound persisted for longer than I felt the dieseling of a new airgun would last. But during this test the rifle suddenly became MUCH quieter. Obviously, it had been dieseling and I didn’t know it.
I originally told Edith it was a 3.7 on the sound scale when I tested it, and she adjusted the loudness level on Pyramyd Air’s product page to 4. But now she can hear that the Octane is clearly a 3. I apologize to everyone who was mislead by my earlier report. The Octane is a normal-sounding breakbarrel air rifle.
Observations thus far.
I said in Part 1 that the Octane holds very well in the hands. The weight is biased forward toward the muzzle, and the stock is slender when the off hand rests. Add the smooth shooting to this, and I think the Octane might surprise us in the accuracy test.
I plan on shooting the rifle at 10 meters with its open sights first. That should give us an idea of which pellets it likes. Then, I’ll mount the scope and shoot those best pellets at 10 meters, again. That does 2 things. First, it confirms the pellets are as good as we think; and second, it allows me time to adjust the scope for the second accuracy test at 25 yards.
by Tom Gaylord, a.k.a. B.B. Pelletier
Here’s another new air rifle from Umarex USA. The Octane combo is a breakbarrel air rifle powered by a gas spring. Umarex calls their gas spring the Reaxis gas piston. That title Reaxis signifies that the gas spring unit is mouned in reverse of what’s normal. Instead of the heavier piston going forward with each shot…what would be the tail end of most gas springs…is where the piston seal is mounted. That lowers the reaction mass, which lowers the recoil felt by the shooter. Whether or not it works as advertised is something I’ll test and report.
I’m testing a .22-caliber rifle, at my request. I dislike wasting the energy of a super magnum gas spring on a .177-caliber gun that can’t develop the full power potential, so this is a chance to test this gun the way I would order it. The manufacturer claims a velocity of 1,250 f.p.s. with lead-free pellets and 1,050 f.p.s. with lead. Of course, you know I’m going to test that, as well.
The rifle I’m testing is serial number 00371165. It’s clearly marked Made in China, but don’t ask me what the base gun is. I find that these rifles change their personality a lot when manufacturers have them built to their specifcations, and tracking down the lineage often becomes misleading.
The Octane is a huge air rifle — 48.5 inches overall with a 14.5-inch pull. And it weighs 8.5 lbs. and 9.5 lbs. with scope and mounts. So, it’s longer than an M1 Garand and nearly as heavy. But that weight is biased toward the muzzle, so the rifle holds very steady — a huge point in its favor. And the black synthetic stock has a forearm with a thin cross-section that makes the rifle sink deep into your hand and hold much easier. Laying your off hand under the forearm just forward of the triggerguard provides a stable resting point.
The stock is designed as a permanent thumbhole with a well-shaped pistol grip. The synthetic material is rough to the touch and is checkered on two small panels on either side of the forearm at the place you want to hold it. The buttpad is a very soft and grippy black rubber pad. It’s fitted perfectly and holds on the shoulder without movement. I normally don’t like thumbhole stocks, but this one saves weight, pushes the weight forward toward the muzzle and seems to compliment the rifle very well.
The open sights are fully adjustable, but they have fiberoptic tubes both front and rear. Aiming is, therefore, not going to be precise unless you light the target to keep the fiberoptics from appearing. I’ll initially shoot the rifle with the open sights at 10 meters to see if this is possible.
But this is a combo that comes with a 3-9X40 scope and mounts. The scope has adjustable parallax down to 10 meters, so it’s ideal for airgun use. I’ll report on it as the test progresses.
There’s one additional point to make about the scope. The rifle comes with a Picatinny scope base attached to 11mm dovetails that are cut directly into the spring tube. So the shooter has the choice of using either Weaver rings that will fit Picatinny grooves, or removing the base from the gun and using the 11mm dovetails directly. Either way, though, there’s no provision for a positive scope stop, which is risky on a rifle that recoils heavily. I’ll be watching for any movement of the scope mounts and bases during the test.
Here you see the Picatinny base that’s attached to the integral dovetails. Either can be used to mount a scope, but neither has a positive scope stop because the base is just clamped to the dovetails.
The metal on the barreled action is finished to a satin sheen. It’s shinier than a matte finish, but not as shiny as most European air rifle finishes.
Like all gas springs, there’s a loud crack when the rifle discharges. The Octane has a silencer muzzlebrake they call the SilencAIR. It has internal chambers that might attenuate the discharge sound somewhat. But it’s still a loud airgun — make no mistake! Pyramyd Air rated it as a 3 on the sound scale. I thought it was closer to 3.7, so Edith changed the loudness rating to 4 since Pyramyd Air’s scale has no fractions. It’s louder than most breakbarrel magnums that have coiled steel mainsprings.
You know I have tried the rifle a few times already — just to see how it feels. I found the 2-stage trigger a bit heavy but very crisp. It’s adjustable, so I’ll see what I can do to it in Part 2. I do like the fact that the trigger blade feels fairly straight up and down because that gives me the feeling of control I want.
I read the reviews of the rifle, and they rate it very high. Accuracy is mentioned by several reviewers. I can’t wait to see this for myself, as I’ve not had good luck with the accuracy of magnum rifles with gas springs. I would love to find one that was accurate.
One thing that might work in the Octane’s favor is that the barrel pivots are screws rather than pins. That means they can be tightened. The ones on the test rifle need to be tightened before testing, as the barrel will not stay in position. The owner’s manual also says to clean the barrel before shooting. I will do both things, and report back to you on how it works.
If there’s a category of airguns that I’m dubious about, it’s the magnum springer — especially the one with a gas spring. I’ve seldom seen them shoot accurately. But I’m more than willing to believe they can be good. And if any of them has a chance, this appears to be the one. Given its power and low price, if the Octane is also accurate I’ll sing its praises to the skies!
by Tom Gaylord, a.k.a. B.B. Pelletier
Photos by Earl “Mac” McDonald
The SHOT Show is not a gun show — though that is what many attendees call it, and the mainstream media that doesn’t attend also calls it that. Instead, it’s a happening — to use a 1960′s term. Or it’s a Middle Eastern open market. The big booths house the recognized names like Colt, Winchester and Crosman. Their booths are two stories tall with signs hanging from the ceiling that you could see a mile away if there weren’t other signs hanging in front of them.
But the real drama of the show isn’t at those booths. People already know what to expect in those places. It’s the little out-of-the-way booths hugging the walls that have the surprises. I always set aside some time just to cruise the aisles, looking for some rocks to turn over.
I’ll be walking along a narrow aisle and someone will step out to stop me. Then, in a conspiratorial tone, he leans over and says something like, “Don’t you just hate it when your ice cubes melt and dilute your drink? Cold Bars have solved that problem forever. These are sanitized stainless steel bars that retain the cold almost as well as water, plus they’re reusable forever. Put three of these in your scotch and soda, and it’ll be as fresh and strong after 20 minutes as when it was poured. When you finish the drink, just pop them in the freezer for 10 minutes…and they’re good to go again. While you wait, you use the second set of three bars in your next drink! Nothing could be easier.”
This guy is serious! You look at his spartan booth and realize that he has poured everything into this venture because at some point watery drinks pushed him over his tipping point. When he bounced the idea off his wife and friends, they all agreed it was the next big thing. They had no idea he would mortgage the house and put his life savings into it!
So, here he is, in a narrow aisle of a large trade show, hawking his brains out to people who, for some reason, just don’t seem to get it. Who doesn’t want cold, undiluted drinks?
Think I’m exaggerating? Attend a trade show and walk the aisles some time.
Why do I plod through these pathways of personal misery? Because next to the stainless steel ice cube booth there ‘s the G+G Airsoft booth that has the best action target I’ve seen in a long while. It’s a lighted rubber hemisphere that’s computer-controlled to react to being hit by an airsoft BB. You can turn the light on or off, depending on how you have programmed it.
They call it the MET Unit, which stands for multifunctional electronic target. It can exist as one single target or they can be strung together in up to 25 targets for a prolonged target array.
The MET Unit is from 1 to 25 programmable lights that turn off or on when hit by an airsoft BB.
The wires between targets can be up to 50 meters in length, which allows them to be set up in a tactical course and either light up at some random time until hit or stay on for a programmed time and go off after the time is up or when hit. Two competitors can shoot at the same target and change the color of the lights when they hit it, establishing a duelling target.
The individual target will sell for $66 or 5 for $250. It looks like a great way to have fast-action fun with airsoft guns. They can take hits from AEGs shooting 0.20-gram BBs at up to 450 f.p.s. Naturally, they’re not robust enough for even the lowest-powered steel BB or pellet guns.
Umarex is now branding airguns under their own name. This year, there are three new long guns: the Octane is a breakbarrel with a Reaxis gas spring and SilencAir, which is a baffled silencer; the Surge is an entry-lever springer breakbarrel; and the Fusion is a CO2 pellet rifle, and it also has the SilencAir noise dampener. We’ve seen the Fusion before, branded as the Ruger LGR, but Umarex tells me the Fusion is a Gen 2 upgrade and quite different. I never got the chance to test the LGR, so I’m looking forward to testing the new Fusion as soon as possible.
The Fusion is a new CO2 single-shot rifle from Umarex that sports a 5-chamber noise dampener.
I spent an hour at the Leapers booth this year. The most important thing I wanted to see was the new scope with an internal bubble level. It’s a 4-16x in a 30mm tube, and it looks exactly like what the doctor ordered for those long-range targets we love to shoot. They’re working hard to get it to market this year, but it won’t go out until they’re certain of the quality. Putting a bubble level inside scopes on a production line is apparently quite a challenge…but one I’m sure Leapers will do correctly.
The entire line of scopes have been upgraded with finer adjustments — many of them 1/8-minute adjustments — and greater repeatability. They have a broad range of adjustment in both directions, and their production models are even exceeding the maximum limits they established! All leaf springs have been replaced with coil springs to increase adjustment precision and repeatability.
But the WOW factor comes on the stuff you can see. How about a 3-9x scout scope (10-inch eye relief) with a wide field of view? That is the big trick for scout scopes, and I saw a beauty mounted on an M1A — though it would be just as correct on a Mosin Nagant.
Leapers new scout scope has a full field of vision — something scout scopes are not known for.
Another surprise from the folks in Michigan is the smallest tactical laser I have yet seen. I asked Mac to photograph it next to a quarter for scale.
Leapers new laser is the smallest I have yet seen. That’s a quarter next to it.
Back to the Crosman booth to show you what the new Benjamin pump looks like when the handle is raised. I didn’t expect the huge reception this pump got when I showed it the first time this year. Please note that it has not one but two pump tubes. This is a 3-stage pump — the same as the current pumps, but this one compresses a bit more air with each stroke. I’ll have more to say about it when I test it.
Maybe this view will help you understand how the new Benjamin pump magnifies the force you put into each pump stroke.
I’ll close with a last look at the Hatsan booth. They have the AT-P carbine and AT-P1 pistol…and both are precharged pneumatics. They’ll come in .177, .22 and .25 calibers that each have hunting levels of power. These are repeaters with circular clips and adjustable Quattro triggers. The sights are fiberoptic, and there are provisions for scopes. The air cylinders remove, and spares will be available as options.
For those who are looking for hunting air pistols, I think these two should be considered. I’ll work hard to review them for you as soon as possible.
The Hatsan AT-P2 Tact (left) and the AT-P1 are exciting new PCP airguns.
Leaving the show
As Edith and I left the show we passed by one final booth. The guy is selling Instant Water for survivalists. Just drop one of his pills in a bucket of water and — Presto! — instant water. Why I can’t think of things like that?