https://shop.misterguns.com/manufacturer/1949/rosco-manufacturingmonthly 0.2 https://shop.misterguns.com/product/26321/rosco-manufacturing-bloodline-saucepack-barrel-300-blackout-8-2-black-w-bolt-carrier-group-gas-tube-non-adjustable-gas-block-sp-bl-82-300-bcg-gtp-ngbdaily0.9