This BCA AR-15 Barrel is a 16" steel contour barrel made from 4150 chrome moly vanadium with a parkerized finish, a 1:10 twist rate and a carbine length gas system. The barrel is chambered in 6.8 SPC ll 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. 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"}}