This BCA AR-15 complete 5.56 Nato rifle length upper has a 16" M4 contour barrel with a 416R stainless steel finish, and features a 1:8 twist rate, with a carbine length gas system. It includes a 15" MLOK rail, an M4 flat-top 7075 billet aluminum upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower. This Slick Side 5.56 NATO upper has no forward assist or dust cover. Bear Creek Arsenal manufactures all AR-15 rifles, complete upper assemblies, barrels, bolt carrier groups (bcg), and components in-house here in Sanford, NC. Choose an American-made AR-15 complete upper assembly from Bear Creek Arsenal, designed for high accuracy and backed by a lifetime warranty. Visit our YouTube channel to see our AR-15s and AR-10s in action and get answers to common questions about your gun. Shop more 5.56 NATO 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"}}