CMC Triggers
Black-nitride 5.56 NATO barrel family with a 1:7 twist, government profile, and six length and gas-system choices.
CMC's government-profile AR-15 barrel family uses a 5.56 NATO chamber, 1:7 twist, black nitride finish, and 1/2x28 muzzle threads. The 8.5 through 12.5-inch and 16-inch versions include the matching gas block and gas tube. The 14.5-inch version instead includes an extended flash hider with a pre-drilled pin hole; the product page does not say it is permanently attached.
Add the CMC AR-15 5.56 Government-Profile Barrel to your build and see how it enhances your platform.