The 450 Bushmaster cartridge allows AR-15 owners to upgrade their familiar lightweight package to big bore stopping power. This powerful cartridge, developed in affiliation with Hornady, is tamed by the AR-type gas-operating system so that recoil is reduced to a heavy thump and second shot control is retained. With bullet velocity of 2200 fps, accuracy out to 200 yards is exceptional, with stopping power ample to take any North American large game. The Bushmaster 450's ChroMoly steel barrel is rifled 1 turn in 24" and chrome-lined in both bore and chamber for exceptional durability and ease of maintenance. A free-floating aluminum forend helps deliver optimum accuracy and the receiver is made of forged aluminum for weight reduction. All operating controls are the same as any AR type rifle. An A2 pistol grip and solid A2 buttstock with trapdoor storage compartment are standard features. Every 450 ships with an operator safety manual, a chamber flag, a sling, and one 5-round magazine.