The BCA AR-15 Barrel is a 18" heavy profile barrel made of 416R stainless steel with a stainless finish, a mid-length gas system with a 1:24 twist rate. The barrel is chambered in .450 Bushmaster and machined with single feed ramps in the barrel extension. Inspections Equipment includes CMMs and Air Gauges for the Bores. 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"}}