"Item LWD-3645TH is intended for use in the Glock 36 pistol only. Threaded .578 x 28 Lone Wolf Distributors match grade replacement 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 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. 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. "