This Bear Creek Arsenal AR-15 Complete 5.56 NATO pistol upper has a 7.5" M4 barrel with a 416R stainless steel finish, and features a 1:7 twist, with a pistol length gas system. It includes the new 6.5" MLOK rail, a M4 flat-top forged upper receiver, a BCA Bolt Carrier Group, Flash Hider, and a Rear charging handle. This 5.56 upper is compatible with any mil-spec AR-15 lower. Shop more 5.56 NATO Uppers! Magazine not included. Check out Magazines here! {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="56"}} {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="98"}} {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="91"}} {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}