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The Glock 43X MOS FR is the optics-ready evolution of Glock's popular Slimline carry platform, and this specific US-made variant adds a front accessory rail to the mix. At just 1.10 inches wide and built around a compact grip paired with a subcompact-slim slide, it carries like a single-stack but gives you 15+1 capacity with the included magazines. The black nDLC-treated steel slide is precision-machined for the MOS optic system and features both front and rear serrations, while the matte surface cuts down on light reflection whether you're running a red dot or keeping it clean with the iron sights.
The centerpiece of the MOS version is the factory-milled Slim MOS slide cut, which uses the Shield RMSc footprint. Optics like the Shield RMSc, Swampfox Sentinel, and SIG Romeo Zero mount directly without any adapter plate. Popular options like the Holosun 507K and EPS Carry use a slightly different K footprint and will need an adapter plate, sold separately. One thing worth knowing upfront: Glock does not include adapter plates with this pistol, and the MOS cut on the 43X is a Slim pattern, which is different from the MOS system found on the Glock 17 or 19, so make sure any plate or optic you buy is spec'd for the 43X specifically.
On the barrel side, this model carries the Glock Marksman Barrel (GMB) from the Gen5 lineup, which features an enhanced polygonal rifling profile and tighter chamber specs for better consistency downrange. It's the same barrel technology that made Gen5 guns shoot noticeably better than their predecessors, and it shows at the range. The frame is smooth and grippy without finger grooves, which makes it more comfortable across different hand sizes. The built-in beavertail helps with a high grip, the reversible magazine catch accommodates left-handed shooters, and the front Glock Slim Mounting Rail gives you a home for a compact weapon light like the Streamlight TLR-7 Sub.
Glock's Safe Action system runs three passive safeties, all of which disengage as the trigger is pulled and automatically reset on release. There's no external thumb safety to manage, which keeps the draw clean and consistent. The extractor also doubles as a loaded chamber indicator, giving you both a visual and tactile check without having to look. Fixed white dot and white outline sights come standard and are perfectly usable for defensive work, though most people running a red dot setup will eventually swap them for suppressor-height sights to co-witness through their optic.
No, Glock does not include adapter plates with the G43X MOS. The slide is factory-milled with a Slim MOS cut using the Shield RMSc footprint, so optics like the Shield RMSc, Swampfox Sentinel, and SIG Romeo Zero will mount directly. For popular options like the Holosun 407K or 507K, you'll need to pick up a compatible adapter plate separately, and it's important to make sure the plate is specifically designed for the 43X's Slim MOS pattern, not the standard MOS found on larger Glock models.
The MOS variant adds two key features over the standard 43X: a factory-milled optics-ready slide and a front accessory rail. The standard 43X has neither, meaning you'd need aftermarket slide milling to run a red dot. The MOS version gives you a clean, factory-supported solution right out of the box, and the Glock Slim Mounting Rail opens the door to compact weapon lights like the Streamlight TLR-7 Sub.
The G43X MOS uses Glock's Slim Mounting Rail, which is smaller than a full Picatinny rail, so not every light will fit. The Streamlight TLR-7 Sub is the most widely used and recommended option for this platform and fits cleanly without adding much bulk. Always verify fit with the specific light model before purchasing, as options designed for full-size rails generally won't work here.
Generally yes, it's a proven carry platform that many people run daily with a red dot. One thing to pay attention to when mounting any optic is screw length. Some optic manufacturers ship mounting screws that are too long for the 43X MOS slide, which can interfere with internal components and cause ejection issues. Use the correct torque spec and verify screw length before heading to the range with a newly mounted optic.
This USA-made FR MOS variant ships with two 15-round Glock factory magazines. The G43X is also compatible with Glock 48 magazines, and Shield Arms makes a popular 15-round steel magazine for the platform as well. Standard Glock 43X and 43 magazines will also function, though they hold fewer rounds and may not sit flush with the grip.
No, the G43X MOS uses a smooth, groove-free grip frame, which is one of the improvements carried over from the Gen5 design philosophy. Removing the finger grooves makes the gun more comfortable for a wider range of hand sizes and shooting grips. The frame also features a built-in beavertail for a higher, more secure hold, and the textured side panels give you plenty of purchase without being abrasive.
| UPC | 764503072864 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UX4350203FRMOS |
| Action | |
| Barrel Finish | Black |
| Barrel Length | 3.41" |
| Caliber/Gauge | 9mm |
| Capacity | 15 + 1 |
| Color | Black |
| Length | 5.47'' |
| Magazine Included | 2 x 15-Round |
| Model | |
| Number of Magazines | 2 |
| Product Type | Striker Fired |
| Safety | Firing Pin/Trigger Block |
| Shipping Weight | 3.0 |
| Sights | Fixed Glock Sights |
| Sights Type | FIXED |
| Slide Description | Serrated w/Optic |
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