Combat Armory Barrel Fits Glock 21 Gen 3-4 45ACP Barrel Threaded .578 x 28

Combat Armory barrel for Glock 21 Threaded Naked Stainless Polished • 45ACP • Drop in fit for Gen 3-4 • Machined from 416 stainless steel and h eat treated to RC 41 • Fully supported chamber and improved feed ramp design • Polished Feed Ramp for easy feeding • Target crown and oversized lock up area • Conventional rifling with a polished chamber and bore to perform well with lead, plated and jacketed bullets • 5.1'' in length