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This BCA AR-15 complete 5.56 NATO rifle length upper has a 16" M4 contour cold Hammer Forged barrel with a black nitride finish, and features a 1:8 twist rate, with a carbine length gas system. It includes standard handguard, an M4 flat-top forged upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This 5.56 NATO upper is compatible with any mil-spec AR-15 lower.