The Glock 23 Gen5 MOS: A New Standard for Big-Bore Competition
Glock has long been the gold standard for reliability, but with the release of the Glock 23 Gen5 MOS, the brand has set its sights on the competitive arena. Historically viewed as a premier law enforcement sidearm, the Gen5 iteration of the G23 introduces a suite of “Marksman” upgrades and optic-ready features that transform this .40 S&W powerhouse into a serious competition contender.
In this breakdown, we explore how the G23 Gen5 MOS stacks up against its predecessor and why it’s being hailed as a major evolution over the 9mm Glock 19 Gen5 MOS for shooters who prefer more knockdown power.
Key Upgrades: What’s New in Gen5?
The transition to the fifth generation wasn’t just cosmetic. For the G23, it meant a complete re-engineering of the slide and frame to better manage the snappier .40 S&W caliber.
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: The G23 Gen5 features a slightly wider, heavier slide than the Gen4. This added mass is a game-changer for competition, as it helps absorb recoil and reduces muzzle flip for faster follow-up shots.
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Glock Marksman Barrel (GMB): Featuring enhanced polygonal rifling and a target crown, the GMB delivers significantly tighter groupings at competition distances.
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Modular Optic System (MOS): The factory-milled slide allows for the seamless mounting of red dot sights—a must-have for modern USPSA or IDPA divisions.
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Ambidextrous Controls: With an ambidextrous slide stop lever and a reversible magazine catch, the G23 Gen5 is now fully optimized for both left- and right-handed competitors.
Glock 23 Gen5 MOS vs. Glock 19 Gen5 MOS
While they share the same compact footprint, these two pistols serve different purposes on the range.
| Feature | Glock 23 Gen5 MOS | Glock 19 Gen5 MOS |
| Caliber | .40 S&W | 9mm Luger |
| Standard Capacity | 13+1 Rounds | 15+1 Rounds |
| Slide Width | 1.34 inches (Thicker) | 1.10 inches (Standard) |
| Best Use | Major Power Factor / Duty | Minor Power Factor / CCW |
The Glock 23 Gen5 is particularly attractive for competition shooters looking to score “Major Power Factor” in specific leagues, providing a scoring advantage that the 9mm G19 simply cannot offer.
Competition-Ready Features
Beyond the caliber, the G23 Gen5 MOS includes several “out-of-the-box” features that give it an edge over other strikers on the market:
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Flared Magwell: The wider opening at the base of the grip facilitates lightning-fast reloads under pressure.
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No Finger Grooves: By removing the grooves, Glock has made the grip more adaptable to various hand sizes and glove thicknesses.
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nDLC Finish: This exclusive Ion-Bond finish provides superior protection against corrosion and scratches, ensuring your pistol survives the rigors of high-round-count competition seasons.
The Verdict: Should You Switch?
The Glock 23 Gen5 MOS is more than just a caliber swap; it’s a refined, optic-ready platform that balances the “compact” size of the G19 with the authority of the .40 S&W round. If you’re looking for a pistol that can transition seamlessly from professional duty to the winner’s circle, the G23 Gen5 MOS is the upgrade you’ve been waiting for.
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