This BCA AR-15 Barrel is a 18" bear claw fluted heavy barrel made of 416R stainless steel with a black nitride finish, a mid length gas system with a 1:8 twist rate. The barrel is chambered in 5.56 NATO and machined with M4 feed ramps 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. BCA's expectations are that our Barrels, 16 inches or longer, will hold a 1.000" MOA at 100 yards with appropriate ammo and shooting techniques. {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}