20" Heavy Barrel 416R Stainless Steel Stainless Steel Finish 1:7 Twist .224 Valkyrie Caliber Rifle Length Gas System MOA Guarantee The AR-15 Barrel is a 20" Heavy barrel made out of 416R Stainless steel, a 1:7 twist rate and a rifle length gas system. The barrel is chambered in .224 Valkyrie. Finished Barrels go through a 100% Inspection Process. 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"}}