AMBIDEXTROUS SIDE CHARGING BILLET AR-15 UPPER RECEIVER
This upper receiver will work with standard rifle cartridges such as .223 Remington ,5.56 NATO, .300 Blackout, 6.5 Grendel, 7.62x39, 9mm Luger, and .350 Legend. This will also work with 9mm Pistol Caliber Carbines.Includes a threaded reveiver plug