Complete, ready-to-install, semi-auto receivers let you change your AR-15 from a sporter to a match rifle or long-range varminter in just minutes-or add to a lower receiver to complete a parts gun. All barrels have six-groove, 1-9″ right-hand twist rifling and M4-type feed ramp. Pre-ban style standard (Std) barrels are chambered for 5.56mm NATO, with A2 flash suppressor, military-style polymer handguard, and A2 front sight housing that includes bayonet lug and riveted sling loop. Most models available with standard manganese-phosphate Parkerized bolt. Mfg: Dpms SPECS: Receiver – aluminum, anodized and Teflon coated, black.