Cold Hammer Forged Barrel This Bear Creek Arsenal AR-15 16" M4 contour, Parkerized 5.56 CHF barrel has a carbine length gas system with a 1:7 twist rate. Our rifle barrels are made from the finest 4150 Chrome Moly Vanadium and precisely rifled for high accuracy at a great price. Cold hammer forged barrels last up to 4x as long as traditional button rifled barrels while maintaining excellent accuracy during sustained fire. Use a Bear Creek Arsenal barrel in your next AR-15 build and experience superior performance backed by a lifetime warranty! All finished barrels go through a 100% inspection process. Inspection equipment includes CMMs and Air Gauges for the bores as well as visual and machine inspection. Shop more 5.56 NATO Barrels! Check out Magazines here! {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="56"}} {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}} Does not include gas block or gas tube