Description
The 43X was already one of the best-selling carry guns in the country when Glock added the MOS treatment, and this version is the one most people end up walking out the door with. You get the same slim frame and compact grip length that made the original a hit, plus a slide milled for micro red dots and Glock's slim mounting rail up front for a light or laser. It's the carry gun that grows with you, whether you run irons forever or bolt on a dot next month.
Why the G43X MOS Works So Well for Carry
The magic here is the proportions. The slide is subcompact-slim, but the grip runs long enough to get your whole hand on it, so you're not fighting a dangling pinky when it's time to shoot. The built-in beavertail keeps the gun settled in your hand, the rough-textured frame gives you grip without chewing up your side, and the reversible mag catch works for lefties too. Capacity is 10+1 of 9mm, and two magazines with high-visibility orange followers come in the case.
Gen5 DNA in a Slimline Package
Glock pulled the good stuff from the Gen5 line for this one. The match-grade Glock Marksman Barrel with its recessed crown tightens up groups noticeably compared to older Glock barrels, and the nDLC finish on the slide shrugs off wear, sweat, and corrosion better than just about any factory coating out there. Precision-milled front serrations make press checks easy, and the short trigger distance suits smaller hands well.
Setting Up Your 43X MOS Optic
The slide cut is designed for popular micro red dots in the RMSc footprint class, think Holosun 507K, Shield RMSc, and similar compact optics. Mounting plates are not included in the box, so grab the correct plate or screws for your dot when you order. Until then, the factory fixed sights with white dot front will get the job done just fine. Glock's Safe Action system rounds things out with three automatic internal safeties and a consistent trigger pull every time.
Key Specifications
- Manufacturer: Glock
- Model: G43X MOS
- MPN: UX4350201FRMOS
- UPC: 764503049989
- Caliber: 9mm Luger
- Action: Striker Fired, Semi-Auto
- Capacity: 10+1
- Barrel Length: 3.39"
- Barrel Type: Glock Marksman Barrel (GMB)
- Overall Length: 6.50"
- Height: 5.04"
- Weight: 18.7 oz (unloaded)
- Slide Finish: Black nDLC, Front Serrations, MOS Cut
- Frame: Black Polymer with Beavertail
- Sights: Fixed, White Dot Front
- Safety: Safe Action System (Trigger/Firing Pin Block)
What’s Included
- Glock G43X MOS pistol
- Two 10-round magazines
- Speed loader
- Cleaning brush and rod
- Hard pistol case
- Owner's manual and cable lock
Frequently Asked Questions
What red dots fit the Glock 43X MOS slide?
The 43X MOS slide cut works with popular micro optics in the RMSc footprint family, like the Holosun 507K and Shield RMSc. Keep in mind that adapter plates do not come in the box, so you'll want to pick up the correct mounting plate or screws for your specific optic. The factory fixed sights work fine until you're ready to mount a dot.
What's the difference between the G43X MOS and the standard G43X?
The MOS version adds a slide milled for micro red dot optics and includes Glock's slim mounting rail on the frame for a compact light or laser. The standard 43X has a smooth slide top and no rail. Everything else, including the grip, barrel length, and 10+1 capacity, stays the same.
Is the Glock 43X MOS a good concealed carry gun?
It's one of the most popular carry pistols on the market, and for good reason. The slide is slim like a subcompact, but the longer grip gives you a full firing grip, which makes it much easier to shoot well than tiny micro pistols. At around 18.7 ounces unloaded, it carries comfortably all day.
Will higher capacity magazines work in the 43X MOS?
The factory magazines are Glock's slim 10-rounders with orange followers, and two come included. Aftermarket companies like Shield Arms make steel magazines in this size that hold 15 rounds, and they've become a common upgrade for this platform. Many folks run those with a metal mag catch for extra capacity without changing the gun's footprint.






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