Tag Archives: Rock River Arms

Crosman MAR177 test report: Part 6

Posted on by B.B. Pelletier ↓ 42 Comments

by B.B. Pelletier

Part 1
Part 2
Part 3
Part 4
Part 5


Crosman’s new MAR177 upper is big news!

Today’s test is shooting the Crosman MAR177 at 25 yards, both with and without the magazine. We’ll also shoot it with the best wadcutter target pellets and the best domed pellets to see what differences there are.

Rather than shoot the rifle myself, I let Mac shoot it this time. He is the better rifle shot between us, and I just wanted to see what the rifle would be like in his hands. He shot it off a bag rest at 25 yards indoors. Ten pellets were shot from the magazine, then another 10 of the same pellet were shot using the single-shot tray. Mac tested both domed and wadcutter pellets, so we get to compare the relative accuracy of both today. And the results did not turn out as I expected. read more

Crosman MAR177 test report: Part 5

Posted on by B.B. Pelletier ↓ 22 Comments

by B.B. Pelletier

Part 1
Part 2
Part 3
Part 4


Crosman’s new MAR177 upper is big news!

Today, we’ll look at the Crosman MAR177 upper shooting domed pellets at 25 yards. I’ll be using the 10-shot magazine, so we’ll get to see that in action, as well. I’ll tell you right now that today was a learning day that spawned another report that’s still to come. Read on to learn what it is.

As you know, the Crosman upper receiver is attached to a lower receiver that I built on a Rock River Arms lower receiver shell. I used Rock River parts, and the trigger is an upgraded two-stage National Match trigger, also from Rock River. read more

Crosman MAR177 test report: Part 4

Posted on by B.B. Pelletier ↓ 39 Comments

by B.B. Pelletier

Part 1
Part 2
Part 3


Crosman’s new MAR177 upper is big news! This view shows the front sight properly oriented.

Today is the first accuracy test day for the Crosman MAR177 upper, so let’s see how this baby shoots. Blog reader Darth Cossack pointed out that I had mounted the front sight backwards in the last report, so I fixed that for today’s photo. It wouldn’t have mattered from a shooting standpoint, but we do want the gun to look right.

On this AR-15, both the front sight and the rear sight adjust for elevation, while the rear sight also adjusts for windage. The front sight requires a sight adjustment tool that I don’t have and didn’t see packed with the upper. You can also use the point of a 5.56mm military round, which I have an abundance of, but doing it that way is very laborious. I’m hoping the rear sight adjustments will take care of everything that’s needed. read more

Crosman MAR177 test report: Part 3

Posted on by B.B. Pelletier ↓ 48 Comments

by B.B. Pelletier

Part 1
Part 2


Crosman’s new MAR177 makes a fine tactical target rifle when attached to an AR-15 lower.

Today, we’re going to see how the new Crosman MAR177 upper performs! Because this rifle is a precharged pneumatic, I used my Shooting Chrony Alpha chronograph to analyze the power curve. Though not absolutely necessary, a chronograph can eliminate a lot of shooting time and let you know how the rifle shoots on the first session.

The test rifle was showing a charge of just less than 1,800 psi when I started the velocity test. I chronographed Crosman Premier Super Match target pellets that Crosman sent with the upper for testing the rifle. read more

Crosman MAR177 test report: Part 2

Posted on by B.B. Pelletier ↓ 68 Comments

by B.B. Pelletier

Part 1


Crosman’s new MAR177 upper is big news!

Today, I’ll document the build of the AR-15 lower receiver that was required for the test of the Crosman MAR177 upper. This was a fascinating and somewhat scary project, because I was venturing into waters that, for me, are uncharted. On one hand, I know that the AR-15 is a popular firearm, so I expected to find all the information I needed to build the lower receiver on the internet. On the other hand, how good that info might be was completely unknown. I was scared because it has been over 30 years since I have had an AR apart, and even then it was only to clean the rifle after firing. I never had to build one. read more

Crosman MAR177 test report: Part 1

Posted on by B.B. Pelletier ↓ 95 Comments

by B.B. Pelletier

Some announcements before we start:

Silas McCulfor is this week’s winner of Pyramyd Air’s Big Shot of the Week on their facebook page. He’ll receive a $50 Pyramyd Air gift card. Congratulations!

BSOTW winner Silas McCulfor took this great picture of his sister holding his Beeman Sportsman RS2 model 1073 dual-caliber air rifle.

Get free tickets to the NRA show in St. Louis. If you’re not an NRA member (they get in free) or have family members and friends who aren’t members, Pyramyd air has some free passes for you ($10 value). To get yours, click to send an email request. Limit of 2 tickets per person. Limited supply. First come, first served! read more