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. Specifications and Features:Action: Semi-AutoCaliber: 5.56 NATOBarrel Length: 16"Capacity: 30+1Trigger: Mil-SpecStock Description: MFT MinimalistMuzzle: A2 Flash HiderReceiver Material: AluminumSights: NoneBarrel Description: Steel ThreadedTwist: 1:7"Barrel Length Range: 16" to 16.99"Hand: Right HandStock Finish Group: BlackMetal Finish Group: Blued/Black