Daniel Defense 0707809136018 DD Barrel 5.56x45mm NATO 16″ Black Phosphate Finish 4150 Chrome Moly Vanadium Steel Material Midlength with Lightweight Profile for AR-15
CMMG 55DC70A Barrel Sub-Assembly 5.56x45mm NATO 16.10″ Black Nitride Finish 4140 Chromoly Steel Material Midlength with Medium Taper Profile for AR-15
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