Rock River Arms LAR-15M All Terrain Hunter, Semi-automatic, AR, 450 Bushmaster, 16 Stainless Steel Barrel, RRA Operator Muzzle Brake, Anodized Finish, Black, Hogue Rubber Grip, RRA 2-Stage Ultra Match Trigger, Carbine length Gas System, RRA 6 Position Tactical Car Stock, RRA 13 Free Float Handguard, 5 Rounds, 1 Magazine 450B1562.V1 Rock River Arms All Terrain Hunter rifle features a 16" stainless steel barrel chambered in .450 Bushmaster. Additionally it features RRA's tow stage ultra match trigger, mid-length gas system and a RRA 13" lightweight M-Lok compatible free float rail. This set-up is a 1 MOA rifle.