Tapco TAP22018 Threaded Barrel 9mm Fits Glock 22 Gen3-4 Drop In Black Nitride Stainless SteelTAPCO Threaded Conversion Barrel for Glock 22 Upgrade your barrel to 9mm with the TAPCO Glock 22 Threaded Conversion Drop In Barrel. An easy to install barrel, simply just drop it in, no gunsmith or other modifications are required. We recommend using Glock 17 magazines for reliable feeding. All threaded barrels also include a thread protector.