Lead & Steel Llc LS9MM5.5-28 AR9 9mm Straight Profile Black Nitride Chrome Moly Vanadium
https://www.tandktactical.com/shop/7427053012560-lead-steel-llc-ls9mm5-5-28-ar9-9mm-straight-profile-black-nitride-chrome-moly-vanadium-57822
https://www.tandktactical.com/web/image/product.template/57822/image_1920?unique=9bf0787
Blowback gas system, no gas block or gas tube needed. Compatible with standard mil-spec uppers and dedicated uppers
