The AR-15 Barrel is a 20" Heavy barrel made out of 416R Stainless steel with a Stainless steel finish, a 1:7 twist rate and a rifle length gas system. The barrel is chambered in .224 Valkyrie with Straight Flutes. Finished Barrels go through a 100% Inspection Process. Inspections Equipment includes CMMs and Air Gauges for the Bores. BCA's expectations is that our Barrels, 16 inch 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"}}