The Radical Firearms Gold Bolt Forged AR15 16" SOCOM 5.56 NATO AR15 Semi-Automatic Rifle uses MIL-STD Upper and lower receivers along with our TiN (Gold) PVD BCG (Bolt Carrier Group) and 15" RPR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. Regardless of whether it’s your first or fiftieth, a Radical Firearms AR rifle will not disappoint!