This BCA AR-15 complete .450 Bushmaster rifle length upper has a 18″ heavy barrel with a 416R stainless steel finish, and features a 1:24 twist rate, with a mid-length gas system. It includes a 15″ MLOK rail, an M4 flat-top forged upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This .450 Bushmaster upper is compatible with any mil-spec AR-15 lower.
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