Rosco Manufacturing Bloodline, 9MM, 4.49 416R Stainless Steel Barrel, 1:10, Melonite Finish, Nitride Black, Fits Glock 17 BL-G17-9MM-M-STD This Glock Bloodline barrel is designed to work with Glock 17 pistols" generations 1 through 4. Although this is a simple to accomplish user friendly swap" they still encourage you to consult a local gunsmith should you have any questions about installation. This barrel is rated for use with SAAMI approved" factory new ammunition. The Rosco Manufacturing's line of Glock barrels are 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.