CMMG 60D100C Barrel Sub-Assembly 6mm ARC 16.10" Black Nitride Finish 416R Stainless Steel Material Rifle Length with Medium Taper Profile for AR-15Price: $144.44
CMMG 55DE10A Barrel Sub-Assembly 5.56x45mm NATO 16.10" Black Nitride Finish 4140 Chromoly Steel Material Carbine Length with M4 Profile for AR-15Price: $158.08