Radical Firearms RF00160: The Radical Firearms 10.5\" Hbar 7.62x39 AR Pistol uses MIL-STD Upper and lower receivers along with our 10\" RPR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. Regardless if it's your first or fiftieth, a Radical Firearms AR pistol will not disappoint! Barrel Length: 10.5\" Barrel Material: 4150 Chrome Moly Vanadium Barrel Finish: Melonite Barrel Profile: Hbar Barrel Thread Pitch: 5/8x24 Chamber: 7.62x39 Twist Rate: 1:10 Barrel Extension: M4 Feed Ramps Gas System: Carbine 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: Yes Dust Cover: Yes Handguard Type: Free Float Handguard Style: M-Lok Thin Rail Handguard Length: 10\" Charging Handle: MIL-STD Lower Receiver: Forged 7075 T6 Lower Receiver Finish: Type III Anodizing Safety: MIL-STD STYLE AMBI Fire Control Group: MIL-STD Buffer Tube: Pistol Tube Magazine: 7.62x39 10 Round