Barrel Length: 16″ Barrel Material: 4140 Chrome-Moly Vanadium Steel Barrel Finish: Melonite Barrel Profile: HBAR Contour Barrel Thread Pitch: 5/8×24 Chamber: 300BLK Twist Rate: 1:8 Barrel Extension: M4 Feed Ramps Gas System: Pistol Length Gas Block Type: .750 Low Profile Gas Block Muzzle Device: A2 Flash Hider Upper Receiver Material: Forged 7075 T6 Upper Receiver Style: M4 MIL-STD Upper Receiver Finish: Type III Anodizing Forward Assist: MIL-STD Dust Cover: MIL-STD Handguard Type: Free Float Handguard Style: M-Lok Thin Rail Handguard Length: 15″ Charging Handle: MIL-STD Lower Receiver: Forged 7075 T6 Lower Receiver Finish: Type III Anodizing Fire Control Group: MIL-STD Buffer Tube: Carbine MIL-STD Stock Adjustment: 6 Postion Magazine: 5.56 30 Round