This BCA AR-15 Complete Upper has a 20" barrel with a Heavy Weight profile, made of 416R Steel with a Stainless Steel finish, and features a 1:7 Twist Rate, a Rifle length gas system. The Upper includes the new 15" MLOK Rail, an M4 flat-top forged upper receiver with forwarding assist, a BCA Bolt Carrier Group, a Flash Hider, and a Rear Charging Handle. It is chambered in .224 Valkyrie and machined with M4 feed ramps in the barrel extension.This BCA AR-15 Complete Upper, like all BCA products, is subjected to numerous QA/QC checks which for our firearms and complete upper receiver assemblies includes test firing prior to approval and shipment.Choose an upper designed by a US company and made in the USA. Choose Bear Creek Arsenal.Magazine not included. 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"}}