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, as can a single-shot tray. The mag and single-shot tray made for the Benjamin Marauder air rifle also fit the MAR177. Both items are shown in the accessory links for this air gun. 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.
AR-15 upper lets you shoot airgun ammo with your AR-15 lower.