Lone Wolf Distributors 9mm conversion barrels allow you to shoot 9mm ammunition from your 40 S&W or 357 Sig pistol. These conversion barrels are easy to use and install the same as any other barrel, simply drop it in, no gunsmithing or other modifications are required. Intended for use in the Glock 22,31 only. We do recommend you use the correct 9mm magazine with these conversion barrels to guarantee reliable feeding. Use G17 9mm mag for G22, G24, G31 and G35 conversion. Lone Wolf Distributors match grade replacment barrels are manufactured from the highest grade mill select 416 stainless forgings. CNC machined and heat treated, providing a life time of service and unparalleled accuracy at an affordable price. The standard grove and land rifling make this an excellent choice for those who wish to shoot lead, plated or jacketed bullets. Can be used in factory ported or stock pistols. Intended for use in the Glock G22 and G31 only. Special features include: Ready to use, pre-fit drop in. No gunsmithing required. Precision machined from heat treated 416R stainless forgings. Oversized lock-up area produces greater shot-to-shot accuracy. Tighter dimensions than the original. Polished feed ramp and bore, diamond turned exterior Maximum chamber support, improved feed ramp design. Match grade broach cut rifling and target crown. Ok to use lead, plated or jacketed bullets. Lifetime warranty. Lone Wolf Distributors will replace any of our barrels or barrel accessories which are found to have manufacturing or material defects. Customer modifications or the use of reloaded ammunition will void this warranty.