This BCA AR-15 complete 6.5 Grendel rifle length upper has a 20″ heavy barrel with a parkerized finish, and features a 1:8 twist rate, with a rifle length gas system. It includes a 15 1/4″ MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a side charging (gen 2) handle. This 6.5 Grendel upper is compatible with any mil-spec AR-15 lower. This has the new handguard.
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