This Bear Creek Arsenal AR-15 Complete 5.56 pistol length upper has a 10.5″ M4 with a parkerized finish, and features a 1:7 twist, with a carbine length gas system. It includes a 9.5″ MLOK rail, a M4 flat-top forged upper receiver, a BCA bolt carrier group, flash hider, and a rear charging handle. This 5.56 upper is compatible with any mil-spec AR-15 lower.
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