Description 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. Regardless if itâs your first or fiftieth, a Radical Firearms AR rifle will not disappoint!Features & Specs:Barrel Length: 16"Barrel Material: 4140 Chrome Moly VanadiumBarrel Finish: MeloniteBarrel Profile: SOCOMBarrel Thread Pitch: 1/2x28Chamber: 5.56mmTwist Rate: 1:7Barrel Extension: M4 Feed RampsGas System: Mid LengthGas Block Type: .750 Low Profile Gas BlockMuzzle Device: A2 Flash HiderUpper Receiver Material: Forged 7075 T6Upper Receiver Style: M4 MIL-STDUpper Receiver Finish: Type III AnodizingForward Assist: MIL-STDDust Cover: MIL-STDHandguard Type: Free FloatHandguard Style: M-Lok Thin RailHandguard Length: 15"Charging Handle: MIL-STDLower Receiver: Forged 7075 T6Lower Receiver Finish: Type III AnodizingFire Control Group: Semi-Automatic MIL-STDGrip: B5 Type 23 Pistol GripBuffer Tube: Carbine MIL-STDStock Adjustment: 6 PostionStock: B5 BRAVOMagazine: 5.56mm 30 Round