Crosman MAR177 AR-15 Upper PCP Conversion Kit

Very impressive, ideal for practicing off-hand in the garage.

Sights are not up to snuff...

If you play the NRA High Power game, this is a handy training aid

Only 200 pellets through it in a week of ownership - so far, very accurate, weighted appropriately for highpower training, holds air and works flawlessly.

Rear sight adjustments are extremely soft and give the impression of uncertain adjustments. I will replace the rear sights/carry handle soon.

So far - absolutely no regrets.

Concept: This is a good concept. Being able to train trigger control on your own AR-15 lower indoors during the winter months or just when lacking time to go to the range.

Quality control is very bad. First the barrel is completely aligned left of center. Just using the naked eye, I can see that the barrel is so far left to the rest of the upper that the barrel is almost touching the left side of the hand guard. The misalignment can also be seen when lining it up to the center of the air tank. The alignment is so bad that when looking through the rear sight it very difficult to even get the front sight (mounted to the barrel) into the sight picture. Second issue is the fit. I have a standard Colt AR-15 A4 lower. You can't get any more mil-spec than that. After mounting the MAR to the lower, there is clear daylight between the two parts. The wiggle between the parts is so severe that there is no way to get any accuracy off this setup.

For $600 I expected better quality. Very disappointed and will be returning it.

Fits great on my 15 lower. Very accurate with my red dot or scope. Functions very well. Easy to pump up to 2000 PSI with the Benjamin hand pump.

Lighten up the over all weight.

The standard sights are not up to snuff. Should be replaced.

The MAR177 fits well on my Yankee Hill lower. I had already made some mods to the Yankee Hill lower (buttstock and trigger) so it was nice to be able to take advantage of those changes. Removed the iron sights and replaced with a 4X combat scope - Shooting indoors on a 10M range this combination has proved extremely accurate. The MAR177 upper is a well made, expensive piece of machinery. Highly recommended for anyone wanting to stay on top of their AR skills.

A friendlier price point.

Compatible with my Rock River Arms LAR-15 NM A4. One thing I have do do differently from the real upper is that the trigger mechanism's hammer has to be pushed down and locked in place when mounting or dismounting this MAR177. Unlike many air guns, there is no need for a separate dry firing mechanism. Documentation states that one way to remove air from the tank is by firing repeatedly, without loading any pellets. It's very accurate. With a competent shooter, and if not constrained by the 4.5 lb. service rifle trigger pull minimum, this could be competitive even in a match air rifle competition (may not win, but at least be competitive). The capabilities allow me to practice far more often than if I had to plan a trip to the range.

The price should've been lower, although I understand the reasons behind the pricing: the limited market on one hand, and the limited buyer choices on the other. It's not a "cheap" item and I've had shooters look at it up close and remark on its quality. It has already saved me several expensive trips to the range.

I bought a Hill Pump and it took only 145 pumps to fill the tank from empty to full. I also had to get an adapter for the pump. Subsequent topping off only takes about 50 pumps from the Hill pump.

I briefly tried non-toxic, high quality (supposedly) pellets for indoor use but the results were abysmal. I switched to RWS Meisterkugeln 8.2 grains and got vastly improved groupings, but I now practice outdoors.

Incredible accuracy out of the box.

The rear sight is very poor for a target rifle. It is unstable and not repeatable. The zero changes when going from center hold to 6 o'clock and back. I would suggest a better quality rear sight base with announced minute of angle description and repeatability, as well as a defined aperture size. For 10 meters, the flip sight is redundant. One size aperture would suffice, and a hooded one with changeable apertures would make this an awesome platform. The price is steep, but for indoor, foul weather practice for high power rifle shooting, it is arguably the best platform going. Wish Crosman would put an air gun lower on it.

I use this for National Match Service Rifle training and practice and it is a really good product for that. It has the correct weight and fits my match lower, with the match trigger, perfectly. The air consumption is also phenomenal. I really enjoy being able to shoot and practice in my home, and although it seems espensive it allows you to compete relatively inexpensively!

The carry handle and sights are really cheap Chinese knock offs. I changed them to National Match sights abd a real carry handle, which was quite a chore.

A lot of people don't understand this product and question the cost and it's usefulness. Not only is it good practice for actual Service Rifle matches, there is a National Match for Service Rifle ariguns now simply because of this product and the men who conceived of it and designed and put it into production. If you have never shot National Match competion here is your chance!

I shoot CMP/NRA service rifle. Bought this upper to practice at home and am well pleased.

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Great way to practice with your own AR lower

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Both the trigger pull and the sight picture are quite different from a competition airgun. This is to be expected since the MAR177-AR is supposed to mimic a NM AR