CMMG 30D120A Barrel Sub-Assembly 300 Blackout 16.10″ Black Nitride Finish 4140 Chromoly Steel Material Carbine Length with Medium Taper Profile for AR-15
Diamondback 556C16M50B8R DB Barrel 5.56x45mm NATO 16″ Carbine-Length Black Nitride 4150 Chrome Moly Vanadium Steel
CMMG 55DE10A Barrel Sub-Assembly 5.56x45mm NATO 16.10″ Black Nitride Finish 4140 Chromoly Steel Material Carbine Length with M4 Profile for AR-15