The BCA AR-10 Barrel is a 20" SOCOM barrel made out of 4150 Chrome Moly with a Black Nitride finish, a 1:14 twist rate and a rifle length gas system. The barrel is chambered in .22-250 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. Visit our YouTube channel to see our AR15 and AR10 barrels in action and get answers to common questions about your gun. {{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