stainless steel 70% 80% 100% Cylinder for Airsoft Gearboxes Smooth Inner Wall Full Flow 72.2mm Length gun accessory
https://www.vogueparade.com/shopping/EN/100005571/1/4001232390979/stainless-steel-70-80-100-cylinder-for-airsoft-gearboxes-smooth-inner-wall-full-flow-722mm-length-gun-accessory//