Glock G43X MOS 9mm
Model: PX4350201FRMOS
Glock G43X MOS 9mm
Model: PX4350201FRMOS
Full Specifications
About This Firearm
The Glock G43X MOS is a slim striker-fired 9mm built for concealed carry with a red dot. Glock announced it on 24 August 2020 and still lists it. Its slide is factory milled for micro reflex sights, and the cut is a non-standard MOS footprint that takes optics on the Shield RMSc pattern.
The pistol arrives with two magazines, a speed loader, a cleaning set, a cable lock and a case, and Glock notes that adapter plates are not among them. The slim mounting rail in front of the trigger guard carries a light cut for Slimline, and the extended magazine catch reverses. Glock set the optic low enough for the standard sights to be visible through the lens, so suppressor-height backups are not needed. Nothing on the grip adjusts, and at 18.55 oz the MOS slide is 0.15 oz lighter than the solid one.
If you're cross-shopping, the Glock G43X without the cut is the same 1.1-inch frame, 3.41-inch barrel and 5.04-inch grip, and it costs nothing in weight or length to skip the optic. The Sig Sauer P365 XL has a factory optic cut too, with a longer 3.7-inch barrel inside 6.6 inches overall, 12 rounds, and 20.7 oz on the belt. The Sig adds rounds and sight radius at 2.15 oz more weight and a taller 4.8-inch grip.
Best For
Strengths & Limitations
- The optic cut is factory work, so the slide finish and the warranty stay intact.
- The 5.4 lb trigger pull, the Marksman barrel and the frame are shared with the plain G43X, so holsters and parts cross over.
- The magazine follower is orange, which makes an empty magazine obvious on a nightstand.
- No adapter plates are in the box, so the mounting hardware is a separate purchase before the dot goes on.
- The footprint is not the common RMR pattern, which narrows the optic list to RMSc-pattern sights.
- Glock's spec page still lists the single-column magazine as standard while its April 2026 release puts a metal double-stack magazine in the box, so capacity depends on when the pistol shipped.
Category Rankings
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Alternatives to Consider
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| NAME | BEST PRICE |
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Glock G43X 9mm
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FN Reflex MRD 9mm
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Smith & Wesson M&P 9 Shield Plus 9mm
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IWI Masada Slim 9mm
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Glock G43 9mm
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Frequently Asked Questions
Which optics fit the Slimline MOS cut?
Glock describes the cut as a non-standard MOS footprint needing specific micro reflex optics, and gives the Shield RMSc as the example. An RMR-footprint dot will not sit on it.
Do I need taller sights with a dot fitted?
No. Glock designed the slim optic position so the standard sights remain visible through the lens of the optic, which is why suppressor-height sights are usually bought.
Does the optic cut change the holster?
The frame, slide length and width match the plain G43X, so a Slimline holster fits, but the optic needs a holster with a cut-out or extra clearance over the top of the slide.
