The Radical Firearms 16" Socom 5.56mm AR rifle uses MIL-STD Upper and lower receivers along with our 15" RPR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. The MFT Grip and MFT Stock provide a comfortable hold on the rifle whether prone or upright. Regardless if its your first or fiftieth, a Radical Firearms AR rifle will not disappoint! Barrel Length: 16" Barrel Material: 4140 Chrome Moly Vanadium Barrel Finish: Melonite Barrel Profile: SOCOM Barrel Thread Pitch: 1/2x28 Chamber: 5.56mm Twist Rate: 1:7 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 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: Semi-Automatic MIL-STD Grip: MFT EPG16V2 Grip Buffer Tube: Carbine MIL-STD Stock Adjustment: 6 Postion Stock: MFT Minimalist Magazine: 5.56mm 30 Round