The BCA AR-10 Barrel is a 20" Heavy barrel made out of 4150 chrome moly vanadium with a black nitride finish, a 1:10 twist rate and a rifle length gas system. The barrel is chambered in .308 and machined with an AR-10 feed ramp in the barrel extension. All finished barrels go through a 100% inspection process. Inspections Equipment includes CMMs and Air Gauges for the bores as well as visual and machine inspection. Shop more .308 Barrels! {{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 Does not include gas block or gas tube