Radical Firearms RF-15, Semi-automatic, AR, 223REM/556NATO, 16 Barrel, A2 Flash Hider, Black Anodized Finish, 15 RPR Rail with MLOK, MFT EPG16V2 Pistol Grip and Minimalist Stock, 30Rd RF01590 The Radical Firearms 16" SOCOM 5.56mm AR rifle uses MIL-STD Upper and lower receivers along with their 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 it's your first or fiftieth, a Radical Firearms AR rifle will not disappoint!