This BCA AR-15 complete 5.56 Nato rifle length upper has a 16″ M4 contour barrel with a parkerized finish, and features a 1:7 twist rate, with a carbine length gas system. It includes a Standard Handguard with front sights, a M4 flat-top forged upper receiver, a BCA Bolt Carrier Group, Flash Hider, and a rear charging handle. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower.
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