This Bear Creek Arsenal AR-15 Complete 5.56 Side Charging 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 7075 billet aluminum upper receiver, a BCA Bolt Carrier Group, Flash Hider, and a right-side charging (Gen2) handle (patent protected). 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"}}