This BCA AR-15 complete 300 Blackout rifle length upper has a 16" black wolf fluted heavy barrel with a 416R stainless steel with a black nitride finish, and features a 1:8 twist rate, with a carbine length gas system. It includes a 11.5" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a Right side charging (Gen 2) handle (patent pending). This 300 Blackout upper is compatible with any mil-spec AR-15 lower.Shop more .300 Blackout Uppers!Check out Magazines here!{{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="56"}}*Note - We strive to provide the most accurate photographs of our product. Variations may occur in the skeletonized section of the handguard/flash hider you receive.{{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}