This BCA 5.56 AR-15 Complete Side Charging (Gen 2) Upper has a 10.5" barrel with a Heavy Barrel profile, made of 4150 Chrome Vanadium with a Black Nitride finish, and features a 1:8 Twist Rate, a Pistol length gas system.The Upper includes the new 10" MLOK Rail, an M4 flat-top forged upper receiver, a BCA Bolt Carrier Group, a Flash Hider, and a side Charging gen 2 Handle. It is chambered in 6.5 Grendel Type II and machined with M4 feed ramps in the barrel extension. Choose an upper designed by a US company and made in the USA. Choose Bear Creek Arsenal. *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. Recommended Products:M-65 (ASC 25rd.)Defender 107 gr., Federal Gold Medal Berger 130gr. {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}} It is the responsibility of the consumer to ensure all state, local, federal, and ITAR regulations are followed