This Bear Creek Arsenal AR-15 20" 7.62x39 Government barrel has a rifle length gas system with a 1:10 twist. Our 7.62x39 Parkerized rifle barrels are made from the finest 4150 Chrome Moly Vanadium and precisely rifled for high accuracy at a great price. Use a Bear Creek Arsenal ar barrel in your next AR15 build and experience superior performance backed by a lifetime warranty! All finished barrels go through a 100% inspection process. Inspections Equipment includes CMMs and Air Gauges for the bores as well as visual and machine inspection. Shop more 7.62 x 39 Barrels! We recommend an enhanced firing pin and Wolf 122gr. (Winchester 123gr., American Eagle 124 gr.). {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}} Does not include gas block or gas tube.