Radical

The Radical Firearms 16 inch HBAR Contour 300BLK AR rifle uses MIL-STD Upper and lower receivers along with the 15 inch 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 rifle will not disappoint! Features : - "Barrel Length: 16";"Barrel Material: 4140 Chrome-Moly Vanadium Steel" - Barrel Finish: Melonite - Barrel Profile: HBAR Contour - Barrel Thread Pitch: 5/8x24 - Chamber: 300BLK - Twist Rate: 1:8 - Barrel Extension: M4 Feed Ramps - Gas System: Pistol Length - Gas Block Type: .750 Low Profile Gas Block