The AR Air Rifle: The Crosman MAR177 PCP Conversion Kit

    Yes, ammo is coming back in stock at reasonable prices, but sometimes a product just catches my eye. The product this time is the Crosman MAR177 PCP conversion kit, which transforms your AR into a Pre-Charged Pneumatic air rifle. The “Modular Adaptive Rifle” fits without modification to any AR-style lower and fires common .177 caliber pellets.

    Image courtesy of

    Image courtesy of, which has an excellent gallery of photos from testing. Click on the picture to be taken to the gallery.

    The MAR177, by design, resembles the M16 in its A2 form, with long barrel, handguard, and iron sights. Crosman states this is for “target use only”, which makes sense since  the conversion achieves only 600 FPS (For reference, AirForce and Gamo tested or currently in-testing go above 1200 FPS). An advantage of the reduced FPS is efficiency. A full tank can get up to 120 shots prior to refill out of the 3000 psi tank mounted beneath the barrel.

    The upper, unmounted to a lower receiver.

    The upper, unmounted to a lower receiver.

    With its long sight radios and free-floated Lothar Walthar barrel, the PCP rifle conversion looks to deliver excellent accuracy. It is bolt-action (charging handle pull) and feeds from a 10 round rotary magazine. Crossman claims that it is shipped ready for “national match” air rifle competition.

    A glimpse at the internals, courtesy of the NRA's Blog.

    A glimpse at the internals, courtesy of the NRA’s Blog.


    Originally released in 2011, this kit has been on the market for some time. The MAR177 retails for $650.

    Hit the video below for a detailed overview. *Note- Those who dislike the confusion over “clips” and “magazines” will cringe. 


    Specifications Overview

    • Model Number MAR177
    • Velocity Up to 600 fps
    • Weight 7 lb. 6 oz.
    • Length 28.5 in
    • Mechanism Bolt Action
    • Power Source PCP
    • Caliber .177
    • Ammunition Pellets
    • Capacity 10 Shot Magazine
    • Barrel 21 in
    • Front Sight Removable post with adjustment
    • Rear Sight Carry handle adjustable flip peep
    • Optics Rail Picatinny
    Nathan S

    One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

    The above post is my opinion and does not reflect the views of any company or organization.