Glock 40
The Glock 40 MOS is the most capable hunting and field pistol Glock makes—a long-slide 10mm with a 6.02-inch barrel and factory MOS optics cut that delivers maximum 10mm velocity, an extended sight radius for precise shooting at distance, and factory optics capability for a mounted scope or red dot. Hunters who use the Glock 20 already know the 10mm’s capability; the G40 MOS takes that platform further with a longer barrel that extracts every foot-per-second the cartridge can deliver and a factory optics system that makes mounting a scout scope or red dot straightforward.
Read our full Glock 40 MOS Buying Guide ↓
Why the Long Slide for Hunting
The G40’s 6.02-inch barrel is the longest available in the Glock lineup and provides the most complete combustion of 10mm powder charges, maximizing muzzle velocity. Full-power 10mm loads from the G40 generate approximately 750–800 ft-lbs of energy depending on load selection—approaching .41 Magnum revolver performance. The extended sight radius—nearly two inches longer than the G20—makes precise long-range shooting significantly more manageable. For hunters who want to push handgun accuracy to its practical limits while retaining the G40’s 15-round capacity, the extended slide provides meaningful real-world advantages.
Factory MOS Optics System
The G40 MOS includes a factory optics cut as standard equipment—it is only available in MOS configuration. The MOS system accepts adapter plates for Trijicon RMR, Leupold DeltaPoint Pro, Docter, and other popular red dot footprints. For hunting use, many G40 owners mount a compact long-eye-relief scout scope using a custom MOS adapter, providing magnification for precise shot placement at hunting distances. A red dot sight is the more common choice for faster target acquisition at closer ranges. The factory optics cut provides a stable, repeatable mounting platform without the additional cost of aftermarket milling.
G40 vs. G20—Which 10mm Glock
The G40 MOS and G20 are both 10mm Glocks with 15+1 capacity but serve different primary purposes. The G20 with its 4.61-inch barrel is the more practical field and carry gun—shorter, lighter, and easier to holster in a chest rig or hip holster for all-day carry. The G40 MOS with its 6.02-inch barrel is the hunting-optimized choice—more velocity, longer sight radius, and factory optics cut for a mounted optic. For hunters who want the best possible performance from the 10mm cartridge and plan to use a mounted optic, the G40 MOS is the clear choice. For backcountry carry where compactness matters, the G20 is more practical.
Hunting Applications
The G40 MOS with full-power 10mm hunting ammunition is suitable for deer, feral hogs, black bear, and mountain lion at reasonable handgun distances. With a mounted red dot, precise shots to 75 yards are achievable for practiced handgun hunters. With a scout scope providing 2–4x magnification, distances push further for skilled shooters. The 15-round capacity provides follow-up shots unavailable from any comparable revolver, and the semi-automatic operation allows faster target reacquisition between shots. For handgun hunters who want the most capable factory semi-auto hunting pistol available, the G40 MOS is the strongest argument.
Competition Use
The G40 MOS sees use in USPSA Open and Limited 10 divisions where the 10mm caliber is legal. The long slide, factory MOS cut, and 10mm power factor make it a capable Open division pistol with a compensator added to the threaded barrel. For Limited 10 competitors who want a factory platform without custom gunsmithing, the G40 MOS provides the extended sight radius and optics capability in a competition-legal package. The 10mm’s power factor makes it a natural major power factor competitor in divisions where that matters.
Where to Go Next
For the more compact 10mm Glock, see our Glock 20 page. Explore the full Glock lineup on our Glock brand page. For 10mm ammunition, visit our 10mm ammo page. For hunting handgun comparisons, see our Revolvers page.