The Crosman Full Auto R1 BB air rifle maximizes backyard fun! Fueled by two 12-gram CO2 cartridges and a 25 round drop-out magazine, you will have target cans flying in no time. The rifle features a genuine feel, familiar controls, and an intense 1400 round per minute rate of fire, all at a jaw-dropping rate of up to 430 fps. Even better, the rifle is fully customizable with a 6 position adjustable stock, AR-compatible buttstock/pistol grip, and a Picatinny rail that provides endless accessory mounting opportunities. Tactical, full or semi-auto BB air rifle Fueled by two 12-gram CO2 cartridges and delivers velocities of up to 430 fps Intense 1400 round per minute rate of fire 25-rounds drop out magazine, compatible with traditional 4.5mm steel BBs Adjustable stock and AR compatible buffer tube and pistol grip Quad forearm accessory rail Realistic weight, action and functions, great for skill development, training and fun