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 Magpul polymer 30rd mag. Model XM15-E2S Bravo Zulu™ Action semi-auto Casing Black Finish Black Safety Yes Caliber 5.56 NATO Capacity 30 Barrel Type 4150 Steel Barrel Length 16"