The MAR177 conversion kit replaces your existing AR/M4 style upper and converts it into a PCP .177 caliber competition air rifle. Designed to support 10-meter match air rifle competition, the MAR177 is just as well suited for target shooters who are interested in maintaining their same shooting platform. The MAR177 offers shooting at a fraction of the cost of centerfire ammunition. The gun features a removeable 10-round rotary magazine, rifled and choked free floating Lothar Walther barrel, airstripper, carry handle and a Picatinny rail system that accepts all mil-spec options for the sight system you prefer. Match grade accuracy. Meets the National Match Air Rifle competition requirements. Ready for competition out of the box. Up to 120 shots per fill. More range time - even indoors. Low noise and minimal recoil.