The Radical Firearms RAD-15 RDR 5.56mm AR rifle uses MIL-STD Upper and lower receivers along with the 15'' RDR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. The B5 Type 23 Grip and B5 Bravo Stock provide a comfortable hold on the rifle in any shooting position. Regardless if it’s your first or fiftieth, a Radical Firearms AR rifle will not disappoint