The Bravo Zulu is designed and manufactured to exceed all expectations. Features a free float rail; MID Length Gas System; Magpul SL Carbine Combat Competition 6 position stock; Magpul MOE Pistol Grip and Picatinny rail. Includes Snake Charmer Muzzle Brake and 5rd BFI 450BM magazine. Model 450 Bravo Zulu™ Action semi-auto Casing Black Finish Black Safety Yes Caliber .450 Bushmaster Capacity 5 Barrel Type 4150 Steel Barrel Length 16"