Radical Firearms RF-10, Semi-automatic, 7.62X39, 16 Barrel, Heavy Barrel Contour, 1:10 Twist, Carbine Length Gas System, Matte Finish, Black, B5 Bravo Stock, B5 Grip, A2 Flash Hider, 15 RPR M-LOK Handguard, 10 Rounds, 1 Magazine RF00078 The Radical Firearms 16" heavy profile 7.62x39 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. Regardless of if it's your first or fiftieth, a Radical Firearms AR rifle will not disappoint!