This new Bear Creek Arsenal AR15 chambered in 450 Bushmaster comes with one 7 round ASC Stainless steel magazine , Mil-spec lower, 15” MLOK rail, 16” Stainless Steel heavy barrel and lifetime warranty from BCA. Insured shipping is $45.00 to the continental U.S. where allowed and no card fees added at Deals on Guns. More ASC 7 round 450 Bushmaster magazines available for $30/magazine. BCA website; The straight walled cartridge of the 450 allows the user to be prepared for a big game shot at 250 meters. Shooting a projectile upwards of 250 grains, 450 Bushmaster is quickly becoming a favorite among deer hunters in the Midwest. .450 Bushmaster, 16" Stainless Steel Heavy Barrel | 1:24 Twist | Carbine Length Gas System | 15" MLOK / standard rear charge. BC-15 | Multi-caliber Lower Assembly | Black Anodized