This tactical, variable pump, BB/pellet Crosman MK-177 air rifle features new valve technology combining lower pumping force with higher velocities. The tactical pistol grip is easy to grasp. Rugged, all-weather construction and rifled steel barrel stand up to repeated use. It has a full Picatinny tactical rail on top with fully adjustable sights and side rails for accessories. The MK-177 is fed by a five-shot pellet clip or choose the internal 300+ BB magazine, conveniently located on the side. The bolt handle is larger and located on left side for ease of use. Store ammo in the handy space beneath the rubber shoulder friction pad. Caliber: .177. Length of pull: 12". Cocking effort: 12-14 lbs. Barrel length: 16.75". Overall length: 33". Weight: 3 lbs. 5 oz.