Glock 21 Gen 3 .45 Auto

Updated August 24, 2026

This Glock 21 Gen3 semi-automatic pistol is chambered in .45 Auto and represents the classic third-generation version of Glock’s full-size large-caliber platform. Serial number DSU521US, this example features an approximately 4.5" barrel with a shiny bore and remains in good cosmetic condition overall. The pistol utilizes Glock’s durable polymer frame with the familiar Gen3 finger-groove grip profile paired with a steel slide and striker-fired operating system. Fiber-optic sights have been installed, adding a bright modern sighting arrangement. No magazine is included. Importantly, the pistol has trigger-related issues and needs work before it can operate properly. It should be professionally inspected and repaired before use. The Glock 21 has long been one of the company’s flagship .45 Auto pistols, combining full-size dimensions with the rugged simplicity for which Glock became famous. This example makes an interesting repair project with desirable Gen3 styling. Please see photos. Glock 21 Gen 3 .45 Auto Semi 4.5 Shiny DSU521US Good

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