TAPCO Conversion Barrel for Glock(R) 22 - Upgrade your barrel to 9mm with the TAPCO Glock(R) 22 Conversion Drop-In Barrel. An easy-to-install barrel, simply just drop it in, no gunsmith or other modifications are required. We recommend switching to Glock(R) 17 magazines for reliable feeding. Fits Glock(R) 22 Gen 3-4 9 x 19 Match Grade 414 Stainless Steel Black Nitride Uses Glock(R) 17 Mag