This Glock Bloodline barrel is designed to work with Glock 19 pistols, generations 1 through 4. Although this is an easy-to-do, user-friendly swap, they still recommend consulting a local gunsmith if you have any questions about installation. This barrel is rated for use with SAAMI-approved, factory-new ammunition. The Rosco Manufacturing line of Glock barrels is a drop-in, match-grade option that enhances the accuracy and performance of any stock Glock pistol. All Bloodline Glock barrels are made from 416R stainless steel, broached, honed, polished, and then melonited. RSR -