Stainless Steel Cylinder Inner Barrel Length 455 - 509 BB Airsoft Smooth Inner Wall, Full Flow,length=72.2mm Paintball Shooting
https://www.vogueparade.com/shopping/EN/100005571/6/1005003599539186/stainless-steel-cylinder-inner-barrel-length-455-509-bb-airsoft-smooth-inner-wall-full-flowlength722mm-paintball-shooting//