This AR-15 BCA side charging Receiver and Bolt carrier group (BCG) combo will work with any mil-spec 223, 5.56, 300 Blackout, or 350 Legend barrel. This combo is a right-side charging (Gen2) handle (patent protected) and BCG, it includes an AR15 bolt carrier group (BCG), a threaded receiver plug, and the bear creek arsenal AR 15 right side charging upper receiver. {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}