The modern defensive pistol must balance stopping power, controllability, and adaptability for optics and user ergonomics. For homeowners and outdoorsmen who want a single platform able to handle close-quarters defense and serious backcountry threats, there are few factory-built options that blend all three as cleanly.

GLOCK G40 GEN 4 MOS is a full-size polymer-framed pistol chambered in 10mm that delivers that balance. Shop this product.

Why the GLOCK G40 GEN 4 MOS stands out

This pistol uses Glock’s Modular Optics System (MOS) to make mounting a reflex sight straightforward—no aftermarket slide or adapter required. The Gen 4 platform brings the Modular Backstrap design and a reversible magazine catch, so the grip geometry and controls can be tailored to any hand size. The stippled polymer grip with finger grooves provides a secure, repeatable purchase for rapid follow-up shots. At a manufacturer’s price of $849.99, it targets buyers seeking a ready-to-use, optics-ready defensive handgun.

Key features explained

Modular Optics System (MOS): Enables direct mounting of red-dot sights to the slide, reducing sight acquisition time and improving accuracy under stress. Modular Backstrap design: Adjust the chassis for small to large hands without tools. Reversible magazine catch: Ambidextrous-friendly setup is practical for left- or right-handed operators. Stippled polymer grip with finger grooves: Enhances control during recoil and extended shooting sessions.

Field performance and 10mm applications

The 10mm cartridge offers exceptional terminal performance and barrier penetration compared with typical handgun calibers. That extra power makes the pistol a credible choice for defending against an aggressive animal or a determined home invader where overmatch is required. Training considerations include selecting manageable 10mm loads for practice and using premium defensive loads for encounters where maximum energy and penetration are warranted.

Glock’s reputation for reliability and simplified maintenance backs up the GLOCK G40 GEN 4 MOS as a tactical tool that stands up to heavy use and adverse conditions. View product details and pricing.

Buying and accessory notes

The MOS-ready slide reduces accessory cost and fitment headaches when adding a reflex sight. Pair the pistol with quality 10mm ammunition and a holster designed for larger frames. Click through to the shop to confirm configuration and purchase—this product page links to our shop where you can complete the buy from the retailer.

For an optics-ready, ergonomically adjustable 10mm platform that’s built for serious defensive roles, check current availability and specifications on the product page. Check availability.

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