Brand New Bear Creek Arsenal, BCA AR-15 complete 5.56 Nato rifle length upper has a 16" M4 heavy contour barrel with a stainless finish, and features a 1:8 twist rate, with a carbine length gas system. It includes a 12 5/16" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a side charging (Gen 2) handle (patent pending), With BCA Engraved mil-spec AR-15 lower. 

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