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Crosman MAR177 AR-15 Upper PCP Conversion Kit

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Crosman MAR177 AR-15

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  • WARNING This product
    WARNING This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
  • MAR177 AR-15 upper PCP conversion kit
  • Fits AR-15 lower*
  • .177 caliber
  • 10-rd removable rotary mag
  • Front sight is a removable post that's adjustable for elevation
  • Rear sight is a carry handle with adjustable flip-up peep sight (2 aperture sizes)
  • Picatinny rail system that accepts all mil-spec options for your preferred sighting system
  • Airstripper
  • Rifled steel barrel
  • Choked, free-floating Lothar Walther barrel
  • Up to 120 shots per fill
  • Built-in manometer (air pressure gauge)
  • Manual crossbolt safety
  • Front sling bracket
  • Meets National Match Air Rifle competition requirements
  • Includes one 10rd rotary mag

*AR-15 lowers can come with different pin sizes. Most have pins that are .250" in diameter. That's what the Crosman MAR177 fits.

Additional 10rd mags can be purchased. It's made for the Benjamin Marauder air rifle but also fits the MAR177.

Crosman's MAR177 is an AR-15 upper and attaches to an AR-15 lower. The lower is a firearm. The upper shown on this page is an airgun. Putting an airgun upper on a firearm lower does not make the entire unit an airgun. It's still a firearm in the eyes of the law. Do not shoot this in areas and locales that do not allow discharging a firearm, as you may be cited for violating the law.

If you've ever wished that your AR-15 could save you some bucks and use airgun ammo, your wish has come true!

The PCP conversion kit is an upper that fits your AR-15 lower and converts it from powder to air. Fill the onboard reservoir with high-pressure air from a pump, scuba tank or carbon fiber tank.

The choked, free-floating Lothar Walther barrel is considered the cream of the crop, and it'll deliver match-grade accuracy. In fact, this conversion kit is designed to let you compete! You can have a cool-looking gun without giving up anything in the accuracy department.

This system is easy to attach to your AR-15 lower. Enjoy more shooting with less noise. Think of all the money you'll save by switching from expensive centerfire ammo to lead pellets!
youTube video
See manual

other products by Crosman

Caliber.177" (4.5mm)
Max Velocity600 fps
Barrel Length21.0"
Overall Length28.5"
Shot Capacity10
Front SightPost
Rear SightFlip-up, adjustable
Suggested forCompetition
PowerplantPre-charged pneumatic
Max Shots per Fill120
Fixed/adj. powerFixed
Weight7.38 lbs
See manual

other products by Crosman

Average Customer Review

4.5 (15 reviews)
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5.0 5.0

By David from USA on 2015-10-07
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Things I liked: Very impressive, ideal for practicing off-hand in the garage.

Things I would have changed: Sights are not up to snuff...

What others should know: If you play the NRA High Power game, this is a handy training aid

4.0 4.0

4.0 4.0

5.0 5.0

By Frank from USA on 2015-06-15
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Things I liked: Only 200 pellets through it in a week of ownership - so far, very accurate, weighted appropriately for highpower training, holds air and works flawlessly.

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

What others should know: So far - absolutely no regrets.


1.0 1.0

1.0 1.0

1.0 1.0

By Edward from USA on 2014-12-06
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Things I liked: 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.

Things I would have changed: 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.

What others should know: For $600 I expected better quality. Very disappointed and will be returning it.

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  • David from USA asked:

    Can I use a normal air compressor to fill this or do I need a scuba tank/compressor

    • Stanley from USA:

      It can be filled easily with a hand pump.

  • jeremy from USA asked:

    Is this a simiauto? Jist wondering if i need to cycle the action every time

    • dave from United Kingdom:

      No not semiauto you need to cycle every shot

  • Harold from USA asked:

    Can you tell me what size air tank it has?

    • John from Canada:

      Dimensions are 18inches long and about 5/8 internal diameter: about 22 cubic inches volume. Takes about 125 pumps of the Benjamin Benjamin Hand Pump, Fits Crosman... pump for 2800psi.

To fill your PCP gun:
1.Pick a source of air shown at right
2.If an adapter is needed, one will be shown
3.Add both to your cart to get hooked up

Crosman MAR177 AR-15 Upper PCP Conversion Kit with quick-disconnect connector (1M)

To start over click reset

Airgun Academy Episode 38 - PCP Filling Systems

Item Description

CRMAR177 [PY-2703-5320]
AR-15 upper lets you shoot airgun ammo with your AR-15 lower.
Caliber.177" (4.5mm)
Max Velocity600 fps