This AR-15 BCA Left side charging Receiver and Bolt carrier group (BCG) combo will work with any mil-spec 7.62x39 barrel. This combo is a gen 2 left-side charging (Gen2) handle (patent protected), it includes an AR15 bolt carrier group (BCG), a threaded receiver plug, and the bear creek arsenal AR 15 right side charging upper receiver. *This does not fit the AR10 Platform. {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}