by Tom Gaylord
Writing as B.B. Pelletier

Crosman MAR
The MAR177 from Crosman.

Part 1
Part 2
Part 3

History of airguns

This report covers:

  • Sighting in the MAR
  • Scope?
  • Shorten the front sight post
  • Back to sight in
  • The test
  • Gamo Match
  • Trigger
  • Sig Match Ballistic Alloy
  • Qiang Yuan Olympic
  • H&N Match Green
  • RWS R10 Match Pistol
  • Discussion
  • Summary

Today we look at the accuracy of the MAR177 for the first time. But before we do — a saga!

Sighting in the MAR

I wanted to shoot the rifle with the iron sights it came with first. To me putting a scope on a military rifle is a bit redneck, unless that rifle is a sniper rifle. 

I shot from 12 feet and the pellet hit the target 2 inches below the aim point. I knew it would climb when I backed up to 10 meters, but it only climbed a quarter inch. Oh, no — I have to adjust the front sight of an AR for elevation. No military person who has carried the M16 likes to adjust its front sight for elevation. It is a slow and tedious process of pressing down a spring loaded pin and turning the front post one click at a time until its where you want it. The rifle was shooting low so I started adjusting the post down. After three clicks the post bottomed out, as in no more adjustment.


I then attempted to scope the rifle so the test could continue, but to no avail. I found umpteen things that stood in the way. The Picatinny rail on the receiver is too short to accept most scopes and anything other than a 2-piece ring set. The magazine sits up so high that only high rings will clear and short scopes present a problem because the flare on their objective bells gets in the way of both the magazine and the forearm. Fortunately I learned everything I need to know to scope the rifle when the time comes.

Shorten the front sight post

I didn’t want to alter the front sight post, but it would never work as it is, so I got out a Dremel tool and a small Swiss file and removed about 0.150-inches from the post. The rifle was shooting low so the front sight had to go down. Remember to adjust front sight in the opposite direction of where you want the pellets to go. The post is now down where I had wanted to adjust it in the first place. Perhaps a better BUIS front sight would give more adjustment — I don’t know.

Back to sight in

I knew the rifle would now be close at 10 meters. Lo and behold it was now in the black! With the first pellet it was perfect for height, so I left it where it was for the remainder of the test.

Find a Hawke Scope

The test

I shot 5-shot groups to speed things up, as well as allowing me to test more pellets. I shot off a sandbag rest at 10 meters with the rifle rested directly on the bag. The A2 stock on my AR prevents me from getting as close to the peephole as I would like. This is where a good 6-position adjustable stock is nice to have.

Gamo Match

The first group we will look at was made by 5 Gamo Match pellets. They went into 0.264-inches at 10 meters. We are off to a good start!

Gamo Match target
Five Gamo match pellets went into 0.264-inches at 10 meters. They are a tad low, so if I were shooting them for score I would have to lower the  front sight just a bit more.


I noticed right away that I needed to get used to the Geisselle trigger once again. Maybe that’s because I was now shooting targets and not just testing the velocity, but I think each time I shoot the rifle the trigger needs a short break-in, or I need a brief familiarization. It’s a strange thing, and I’m recording it now so I’m aware of it next time.

Sig Match Ballistic Alloy

Next up were 5 Sig Match Ballistic Alloy pellets These are sometimes very surprising and today was no exception. They produced the best group of the day — five in 0.152-inches. It was almost a gold dollar (under 0.15-inches, C-T-C) and was most worthy of the trime (under 0.20 C-T-C).

Sig Match target
The MAR177 put 5 Sig Match Ballistic Alloy pellets in 0.152-inches at 10 meters. This is the only trime-worthy group of the test.

Qiang Yuan Olympic

Next to be tested were 5 Qiang Yuan Olympic pellets. They were almost perfectly centered on target in a group that measures 0.226-inches between centers.

Qiang Yuan Olympic target
Five Qiang Yuan Olympic pellets were close to the center of the bullseye and measure 0.226-inches between centers.

H&N Match Green

The next pellet I tried was the H&N Match Green target pellet. Sometimes these are very accurate. but this time five of them went into a group that measures 0.388-inches between centers. It’s the largest group of this test.

H&N Match Green target
The MAR177 put 5 H&N Match Green pellets into a 0.388-inch group at 10 meters. It’s the largest group of the test.

RWS R10 Match Pistol

The last pellet I tested on this day was the 7-grain RWS R10 Match Pistol pellet. I actually fired it first, but I wasn’t settled down and the group was not indicative of what the rifle can do. So I shot a second 5 of them at the end of the test and got a 0.247-inch group. That is representative of what the MAR177 can do with this pellet.

R10 Match Pistol target
Five RWS Match Pistol pellets went into 0.247-inches at 10 meters.


I’m pleased with the results of today’s test, though I don’t think I have found the best pellet yet. The magazine is breaking in and now seats in the receiver quite easily. And most pellets drop all the way into the chambers of the mag without any help.

I think the time I spent working on the sights distracted me a little and I would like to have another go at this, now that I have the sights where they need to be. I would really like to find the best pellet.

I do plan on shooting with a scope, as well, but I want that to be a separate test, after I have finished with the open sights.


The MAR177 is proving to be as interesting as I remembered. I think it can do even better and I hope to see it soon.