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See All Open Sight: Part 2

by Tom Gaylord, a.k.a. B.B. Pelletier

Part 1

See All Open Sight
The See All Open Sight is revolutionary!

This is the first test of the See All Open Sight. I chose the Crosman M4 –177 as the first rifle to be tested because the See All comes only with a Weaver base, and the M4-177 has a Picatinny rail that will accommodate it. The choice was based solely on that and little else, except the M4 had been shown to be fairly accurate at 10 meters.

For the test, I decided to fire a 10-shot group using the factory sights, which are a peep in the rear and a post up front. Since the rifle was stored in the box without its sights, they had to be mounted and sighted-in. I started with Crosman Premier Super Match wadcutter pellets but switched to 7.9-grain Crosman Premier lites after seeing the size of the Super Match group.

I was shooting from a sandbag rest at 10 meters. Five pump strokes were used for every shot in this test. The group of 10 Premier lites measured 0.84 inches, so that’s what I’ll use to compare the results from the See All sight.

See All Open Sight accuracy test control group
Ten Crosman Premiers went into 0.84 inches at 10 meters when the factory sights were used.

Mounting the See All Open Sight
The sight went on the flattop receiver easily enough, and the 2 screws that hold it in position work well. But after I mounted the sight, I discovered that it was impossible to get my head low enough on the stock to see the reticle. All I could see was the See All name that’s beneath the triangle. The sight needed to be adjusted up.

Sighting-in
I adjusted the sight up as far as it would go and got the reticle up to where I could just barely see it if I held my head artificially low on the stock. To sight the rifle on the target, I had to tilt my head far to the right to get my eye low enough to see the full reticle. I used a 6 o’clock hold on the bull for all my shooting with this sight, which is the only way to be precise with a sight that covers the bull.

With this sight picture, I missed the entire paper at 10 meters. So, I walked up to within 10 feet of the target and aimed again. This time the pellet struck the target backer board about 6 inches below the aim point. Something had to be done, and done quick!

I had positioned the See All sight as far forward on the receiver rail as space permitted, so now I moved it back as far as it would go, like the position of a peep sight. This made sighting easier, though I was still tilting my head way over to the right to see the reticle.

With the sight in this position, I put a Shoot-N-C bull at the top of a blank sheet of target paper and shot 4 shots at it from 10 meters. They landed about 7.5 inches low on the paper, as you can see in the photo.

See All Open Sight accuracy test first attempt 10 meters
Four Crosman Premiers went about 7.5 inches low at 10 meters. The aim point was the bottom of the bull at the top of the backer board.

This wasn’t working! And the reason it wasn’t is the straight line of the M4-style rifle. The flattop receiver doesn’t permit mounting the See All Open Sight high enough to be seen easily. It’s not the sight’s fault — it’s the rifle’s.

I was ready to call it a day when Edith suggested that I mount the sight to the Picatinny rail where the rifle’s front sight is supposed to go. It was simple enough to move the sight, so I tried it and found I could see the reticle much easier. A test shot showed that it was hitting the target way too low, however. Because the sight had been moved from the rear to the front, the adjustments had to be reversed to work.

See All Open Sight moved to front
Thanks to Edith, the See All Open Sight was mounted to the front sight base, and the reticle became easier to see.

You move a front sight in the opposite direction you want the strike of the round to go, so  now I had to adjust the sight as low as it would go, to bring the point of impact up as high on the target as possible. The See All sight doesn’t have much adjustment up and down — only 45 minutes of angle. When it was down as far as it would go, the pellet was still hitting the target about 2 inches below the aim point, but that was a lot better than it had been before. So, kudos to Edith for this suggestion that kept the test running!

I shot 2 groups with the sight in this position. The first one isn’t very good, as I had half the aim point covered by the target paper, and the tip of the triangle was on the center of the bull rather than at 6 o’clock. But I still got a group that is good horizontally. It’s just spread out too much vertically.

See All Open Sight accuracy test first 10-shot group 10 meters
This 10-shot group is tall, at 1.803 inches between centers, but not that wide. The aim point was an estimate of where the center of the top bull was located because the target paper covered half of it.

When I mounted the second target, I fixed the situation. The second group was shot with a 6 o’clock hold on the top bull. The aim point was much more precise in this case, and the group shows it. Although the overall group is the same 1.803 inches as the first group, 9 of the holes are in 1.125 inches. Like the first group, this one is also strung out vertically.

See All Open Sight accuracy test second 10-shot group 10 meters
This 10-shot group is identical in size to the first one (1.803 inches), but 9 of the shots are grouped much better at 1.125 inches. Notice that 6 shots went into a single hole!

What’s wrong?
It seems that the See All sight isn’t made for a rifle with a straight stock line like the M4′s. The eye is too high relative to where the line of sight is. This can be seen when the factory sight is mounted next to the See All.

See All Open Sight mounted with factory sight
I mounted the factory peep sight and the See All Open Sight together on the flattop rail.

See All Open Sight and factory sight comparison
This photo shows how much higher the factory sight line is than the sight line of the See All sight.

Conclusions
The straight lines of the M4 rifle are all wrong for use with the See All Open sight. With a flattop receiver, it’s impossible to get the sight mounted high enough to see without holding your head at an odd angle. So, this test was inconclusive. All it proves is that the wrong rifle was used. However, this should serve as a warning to those who might think of using the sight on their other M4-type rifles. Unless you put a high adapter under the sight to raise it up, it won’t work.

The vertical adjustment range of the See All sight is not large enough for an air rifle whose barrel is slanted downward, as so many of them are. It’ll be necessary to mount the sight on some kind of compensating base for the next test. I’ve selected a TX200 Mark II as the next test rifle, and we’ve already done a test of this rifle with a red dot sight. I have a drooper base that Leapers made when we developed the UTG drooper bases for RWS Diana rifles, and this one has no recoil shock shoulder; so, it’ll go right on the TX200 without a problem.

I’m encouraged by how easy it was to acquire the sight picture once the See All was mounted in the right position. It was much faster than a peep sight picture; and even though the overall group made with the sight is larger than the group made with the peep sight, I see that many of the pellets went to the same place. That gives me confidence that the See All Open Sight will work well when mounted on the right rifle.

I also see a bright future for this sight on pistols. The farther away from the eye the sight is, the easier it is to see the reticle. Holding it an arm’s length from the eye is no problem. I’ve already confirmed that the Leapers base fits my Beeman P1, so a test of that pistol is in the works, as well.

Crosman MK-177 multi-pump pneumatic: Part 3

by Tom Gaylord, a.k.a. B.B. Pelletier

Part 1
Part 2

Crosman MK 177 multi pump pneumatic
Crosman MK-177 is a multi-pump version of FN’s SCAR.

Today, we’ll begin testing the accuracy of the Crosman MK-177 multi-pump pneumatic. Because this rifle shoots both pellets and BBs, I’ll test both, but not at the same time and not in the same way. Today’s test of lead pellets was done at 10 meters, using the iron sights provided with the rifle.

I decided to use 5 pumps per shot for the entire test. That was both easy to do and was also pretty quick. According to the velocity test we did last time, Crosman Premier lites were averaging just over 500 f.p.s. on 5 pumps.

It took five shots to sight in the rifle. The first shot was 3 inches high and 2-1/2 inches to the right. Crosman supplies a sight adjustment tool with the MK-177, and I had to use both ends of it. One end is a flat-bladed screw driver that moved the rear sight to the left. The directions are printed on the sight, so there’s no confusion.

The front sight had to be raised because the rifle was shooting too high, so I unscrewed the front sight post several turns. Shot 2 was about three-eighths of an inch too high and three-eighths of an inch too far to the right. The hole was in the black bull, but it wasn’t centered. So, I made small adjustments to both the front and rear sights and fired again. This shot cut the 9-ring, which was close enough for me. I fired the other 2 shots, and they landed near the third shot. Sight-in was finished.

Crosman Premier lites
This is a Crosman rifle, so the first pellet I chose to test was the Crosman Premier lite. The first pellet hit the 10-ring of the bull, so I stopped looking through the spotting scope and just shot the gun. After the 10th shot, I looked at the target and saw a disappointing horizontal group that measured 1.173 inches between centers. None of the shots had been called as pulls (meaning the sights were off target when the gun fired), so this group surprised me.

Crosman MK 177 multi pump pneumatic 10 meters Premier lites
Ten Crosman Premier lites made this 1.173-inch group at 10 meters with the Crosman MK-177 pneumatic. It is surprisingly wide for 10 meters.

Air Arms Falcons
Next to be tried were the Falcons from Air Arms. They’re domed pellets made by JSB and weigh 7.33 grains. Once, again, the first shot cut the 10-ring, and I never looked after that. This time, the group was much better, measuring 0.839 inches between centers. It’s also much rounder than the Premier lite group, leading me to think the rifle likes this pellet better.

Crosman MK 177 multi pump pneumatic 10 meters Falcons
Ten Air Arms Falcons made this 0.839-inch group at 10 meters. This group is rounder than the first, which is a good sign.

The rifle’s behavior
At this point, I’ll comment on how the rifle performs. Shooting for accuracy I found the left-mounted cocking handle to be less of a problem than it had been when I tested the velocity. My procedure was to cock the bolt, advance the magazine, close the bolt, then pump the gun. This became a routine after a few shots, and it went surprisingly fast.

I rested the rifle on a sandbag for the shooting. Though it’s very light, the rifle was dead calm on the bag. The sights did not move one bit. And the MK-177′s trigger is so light and smooth that I found it very easy to shoot this way.

Pump effort identical to the 760
A reader asked me last time how this rifle compares to the 760 Pumpmaster in pumping effort. Silly me! I should have realized that the MK-177 is a 760 in another skin, but I tested my 40th Anniversary 760 just to make sure. The pumping effort is identical; or if there’s a small difference, the 760 is slightly harder because the MK-177 pump arm is a little longer.

RWS Hobbys
The next pellet I tried was the RWS Hobby. These fit the clip a little tighter, and I could feel some resistance when the bolt pushed them into the breech. Again, I checked the target after the first shot then never again until I was through. I noted that this pellet moved over to the left side of the bull with no change to the sights. There’s a lesson to remember!

Hobbys grouped very close to Falcons, with the difference being due to measuring error more than any real practical difference. Ten Hobbys went into 0.858 inche…again, the group is fairly round.

Crosman MK 177 multi pump pneumatic 10 meters Hobby
Ten RWS Hobbys made this 0.858-inch group at 10 meters. This is so close to the Falcon group that it’s too close to call. Hobbys are wadcutters which cut cleaner holes, and may have lead to their group measuring slightly larger.

H&N Match Pistol
At this point, I was ready to declare the MK-177 to be an accurate multi-pump, but I had one more pellet on the table to test. And that one was the H&N Match Pistol pellet — another wadcutter. I’ve had remarkable results with H&N Finale Match Pistol pellets in some target rifles, but the straight Match Pistol pellet has never done better than average. Until this test!

Ten pellets went into a group that measures 1.239 inches between centers. No record there! But look at the tiny group that 9 of those 10 pellets made! It measures just 0.399 inches and is very round! Ladies and gentlemen, I think we have a winner!

Crosman MK 177 multi pump pneumatic H&N Match Pistol
Ten H&N Match Pistol pellets went into a 1.239-inch group, but 9 of them went into 0.399 inches! I think this pellet might be the best one for this rifle.

From the results seen here, I think the MK-177 is a very accurate air rifle. It’s worthy of a 25-yard test with an optical sight. I’m thinking the red dot sight I’m using on the TX200 Mark III would be good for that. Before I do that, though, I’ll test the rifle with BBs at 25 feet.

So far, the MK-177 is a real winner! I enjoy the ease of use and the accuracy. If I didn’t already own a 760 and an M4-177, I would, perhaps, buy this one.

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Swiss Arms P92 CO2 BB pistol

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