Radical Firearms FR-16 5.56mm NATO 16in Black Type III Anodized Semi Automatic Modern Sporting Rifle - 30+1 Rounds - The Radical Firearms 16in SOCOM 5.56mm AR rifle uses MIL-STD Upper and lower receivers along with their 15in 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! Barrel Material: 4140 Chrome Moly Vanadium Barrel Finish: Melonite Barrel Profile: SOCOM Barrel Thread Pitch: 1/2in x 28 Barrel Extension: M4 Feed Ramps Gas System: Mid Length Gas Block Type: .750 Low Profile Gas Block Muzzle Device: A2 Flash Hider Upper Receiver Material: Forged 7075 T6 Upper Receiver: M4 MIL-STD Type III Anodizing Forward Assist: MIL-STD Dust Cover: MIL-STD Handguard Type: Free Float Handguard Style: M-LOK Thin Rail Handguard Length: 15in Charging Handle: MIL-STD Lower Receiver: Forged 7075 T6 Type III Anodizing Fire Control Group: Semi-Automatic MIL-STD Buffer Tube: Carbine MIL-STD Magazine: 5.56mm 30 Round