Diamondback 556C16M50B8R DB Barrel 5.56x45mm NATO 16″ Carbine-Length Black Nitride 4150 Chrome Moly Vanadium Steel
CMMG 30D810A Barrel Sub-Assembly 300 Blackout 8″ Black Nitride Finish 4140 Chromoly Steel Material Pistol Length with Medium Taper Profile for AR-15
Wilson Combat TR556SBRCG11RT7 Match Grade Barrel 5.56x45mm NATO 11.30″ Threaded Bead Blasted Stainless Steel, Fits AR-15