The Glock 40 Gen 4 MOS is a long slide striker fired semi-automatic pistol chambered in 10mm Auto. It operates on the Glock Safe Action system, a short recoil, locked breech design utilizing a modified Browning cam-lock action. The Model 40 is the long slide variant in Glock's 10mm lineup, featuring a 6.02 inch barrel that provides increased sight radius and muzzle velocity compared to the standard length G20. The Gen 4 iteration introduced a modular backstrap system with multiple inserts to adjust grip circumference, a reversible enlarged magazine catch, and a dual recoil spring assembly. The long slide configuration, 10mm chambering, and optics ready MOS slide position the G40 as Glock's primary offering for handgun hunting and field use.

This example features the MOS (Modular Optic System) slide, Glock's standardized optic mounting system allowing for the use of varying red dot footprints by utilizing interchangeable adapter plates. The pistol is finished with a black polymer frame with finger grooves and a textured grip surface, paired with a black finished steel slide with rear serrations. Standard Glock polymer sights are installed. Accompanied by three 15-round magazines, original case, and interchangeable backstrap set.

Specifications

• Manufacturer: Glock
• Model: 40 Gen 4 MOS
• Caliber: 10mm Auto
• Action: Striker fired, short recoil
• Barrel Length: 6.02 inches
• Frame: Polymer, black
• Slide: Steel, black finish, MOS optic cut, rear serrations
• Sights: Polymer fixed sights
• Safety: Trigger safety, firing pin safety, drop safety
• Magazines: Three 15-round magazines