AR-15 Government 16" 5.56 NATO 1:7 Mid Length Gas Barrel
AR-15 Government 16" 5.56 NATO 1:7 Mid Length Gas Barrel, Chambered in 5.56 NATO Government profile 16" length Mid-length length gas system 1:7 right-hand twist 4140 chrome-moly lining Hard black nitride coating 0.063" gas port 0.750 gas block journal 29 oz weight