Lone Wolf 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. We do recommend you use the correct 9mm magazine with these conversion barrels to guarantee reliable feeding. Use G17 9mm mag for G22, G31 and G35 conversion.Lone Wolf replacement barrels are manufactured from the highest grade mill select 416 stainless steel. CNC machined and heat treated, providing a life time of service and unparalleled accuracy at an affordable price. The standard groove 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 22,31 pistol only.Features:Ready to use, pre-fit drop in. No gunsmithing requiredFits Glock Gen3 and Gen4Precision machined from heat treated 416 stainless steelLock-up area produces greater shot-to-shot accuracyTighter dimensions than the originalGlass bead, satin finish exteriorMaximum chamber support, improved feed ramp designButton rifled, standard crownOk to use lead, plated or jacketed bulletsProudly made in the USA