This BCA AR-15 complete 6.5 Grendel rifle length upper has a 20″ heavy barrel with a black nitride finish, and features a 1:8 twist rate, with a rifle length gas system. It includes the new 15″ MLOK rail, an M4 flat-top forged upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This 6.5 Grendel upper is compatible with any mil-spec AR-15 lower.
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