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
Rosco Manufacturing PB-16-HB-300BLK-8-P Purebred 300 Blackout 16″ Nickel Boron Stainless Steel Barrel