The Glock 21 Gen4 is a full-size .45 ACP semi-automatic pistol built around Glock's durable polymer frame and Safe Action system. This police trade-in features factory Glock night sights, a 4.61-inch barrel, and a 13+1 capacity. Gen4 interchangeable backstraps help tailor the grip to the shooter, while the textured frame provides a secure hold. This used example includes one magazine and a case. The bore is reported to be in very good condition, and individual pistols may show holster wear on the frame, particularly near the muzzle.

Key features

• Full-size .45 ACP pistol with 13+1 capacity for duty, defensive, and range use
• Factory Glock night sights support aiming in low-light conditions
• Gen4 interchangeable backstraps allow grip-size adjustment
• Safe Action trigger system includes an integrated trigger safety
• Durable polymer frame helps reduce weight while maintaining service-ready strength
• Includes one magazine and a case

The Glock 21 Gen4 combines proven service-pistol durability with a high-capacity .45 ACP platform and low-light-ready sights.