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Glock, the Austrian firearms manufacturer renowned for producing ultra-reliable semi-automatic pistols, has become a cornerstone of the concealed carry market. Known for its minimalist, striker-fired handguns, Glock introduced the Glock 43X MOS to meet growing demand for slim, concealable pistols with modern features like optic compatibility. This model was launched as part of Glock’s effort to expand its Slimline series, offering a balance between everyday carry comfort and performance enhancements.
The Glock 43X MOS is a compact 9mm pistol with a 10+1 capacity, 3.41-inch barrel, and Glock’s signature polymer frame. Performance-wise, it delivers smooth operation, minimal recoil, and reliable feeding under various conditions. Price-wise, it sits in the mid-range Glock category, offering great value given its optic-ready slide and modular potential.
In this review, you’ll discover the origin of the Glock 43X MOS, how it compares to similar models, its real-world pros and cons, the best upgrades and accessories available, and which Craft Holsters fit it best. You'll also get a detailed FAQ and direct comparison to other Glock favorites.
Glock 43X MOS: Background & First Impressions
The origin of the Glock 43X MOS stems from Glock’s strategic response to the demand for optics-ready carry pistols. First released in 2020, the Glock 43X MOS was designed to build upon the popularity of the original Glock 43X by introducing modularity and red dot compatibility without sacrificing concealability. Glock recognized that many users were modifying their carry pistols for red dot use, so they brought the MOS system to their Slimline series.
When I first laid my hands on the Glock 43X MOS, I instantly took a liking to its compact size that just fits my hands like a glove. The pistol feels balanced, and its slightly extended grip offers improved control over the original 43 or 43X, especially during rapid strings of fire.
The Glock 43X MOS pistol is based on the proven frame of the standard Glock 43X but adds a factory-milled slide cut compatible with popular micro red dot sights like the Shield RMSc and Holosun 507K. This makes it one of the most compact and ideal concealed carry Glock pistols available today—built for reliability, precision, and easy daily carry.
The combination of practical updates and Glock's signature build quality makes the Glock 43X MOS a standout in the market. Its launch marked an important milestone in expanding red-dot-ready concealed carry options without relying on aftermarket modification.
Key Features of Glock 43x MOS
Glock 43X MOS is a slim, optics‑ready 9mm concealed‑carry pistol. Evidence: it combines a 3.41" barrel and 10+1 single‑stack capacity with a factory‑milled MOS slide, nDLC finish, slim polymer frame, single‑slot accessory rail, and Glock’s striker‑fired trigger to deliver dependable function, easy concealment, and quicker target acquisition when paired with a micro red dot.
Main Specs of Glock 43X MOS
| Glock 43X MOS Specs | Glock 43X MOS Spec Value |
|---|---|
| Caliber | 9x19mm (9mm Luger) |
| Magazine Capacity | 10+1 rounds (standard) |
| Height | 5.04 inches |
| Width | 1.10 inches |
| Overall Length | 6.5 inches |
| Barrel Length | 3.41 inches |
| Front Sight | Factory fixed Glock front sight |
| Rear Sight | Factory fixed Glock rear sight (optic-ready slide) |
| Frame Material | Polymer |
| Slide Material / Finish | Steel slide with nDLC finish |
| Red Dot Ready | Yes — factory MOS (micro‑optic) cut |
| Accessory Rail | Slim single‑slot Glock rail |
| Weight (Unloaded) | ~18.6 oz (around 18.55–18.7 oz) |
| Price | Approximately $550–$750 (street price, varies by retailer and region) |
Glock 43X MOS Pros and Cons
The pros and cons of Glock 43X MOS reflect its role as a purpose-built concealed carry pistol with modern upgrades. A key advantage of the Glock 43X MOS is its factory MOS (Modular Optic System) cut, allowing direct mounting of micro red dot sights—this dramatically improves target acquisition speed and low-light performance, especially for EDC users. However, one notable drawback is that Glock does not include the optic mounting plates, requiring an additional purchase and limiting immediate out-of-the-box optic compatibility. Despite this, the overall pros and cons of the Glock 43X MOS make it one of the most forward-thinking subcompact pistols in Glock’s Slimline series.
What are the main advantages of Glock 43X MOS?
The Glock 43X MOS stands out as one of the most well-rounded concealed carry pistols in Glock’s lineup. The key Glock 43X MOS benefits stem from its slim design, modern features, and proven reliability. Below is a definitive list of Glock 43X MOS advantages that highlight why it continues to gain popularity among everyday carriers.
- Optics-Ready Slide (MOS Cut): One of the most significant Glock 43X MOS pros, enabling direct mounting of micro red dot sights for faster target acquisition.
- Slimline Frame with 10+1 Capacity: Offers excellent concealability without compromising on round count.
- Lightweight Construction: At just 18.6 oz unloaded, it’s ideal for all-day carry with minimal fatigue.
- Improved Ergonomics: The grip texture, extended beavertail, and balanced profile provide better control and recoil management.
- Glock Reliability: Consistent performance across various ammo types, minimal maintenance needs, and a long service life.
Together, these Glock 43X MOS advantages make it a top-tier choice for concealed carry, blending functionality, size, and modern compatibility in one defensive handgun.
What are the main disadvantages of Glock 43X MOS?
Just like previously mentioned, the biggest disadvantage of the Glock 43X MOS is the lack of included optic hardware. Besides that, quite a few shooters have reported the Glock 43X MOS problems listed below. Fortunately, most of these Glock 43X MOS issues are relatively easy to fix with simple upgrades or minor adjustments. Check out our blog on the most frequent Glock 43X MOS problems and learn how to effectively solve them.
- Glock 43X MOS optic hardware (missing): The 43X MOS is red‑dot ready but does not include mounting plates or an optic; consequence: additional purchase and verification of plate/optic compatibility.
- Glock 43X MOS holster compatibility: Many standard 43X holsters don’t accept the MOS cut or a mounted micro‑dot; consequence: you’ll likely need an optics‑specific holster for safe retention and draw.
- Glock 43X MOS factory sights: Stock sights are serviceable but basic; consequence: many owners upgrade to tritium or steel sights for faster acquisition and better low‑light performance.
- Glock 43X MOS limited rail options: The slim single‑slot rail restricts light/laser choices compared to full‑size rails; consequence: fewer compact accessory options and possible compromises on light performance.
- Glock 43X MOS grip length for large hands: The single‑stack 10‑round grip can feel short for users with large hands; consequence: reduced purchase and slightly slower reload ergonomics for some shooters.
These Glock 43X MOS disadvantages are mostly manageable with straightforward upgrades (optic plate + holster, sights, magazine/baseplate changes) and proper training, but they’re important to consider before relying on the pistol for everyday carry.
Best Upgrades for Glock 43X MOS
The best upgrades for the Glock 43X MOS are targeted, practical modifications that measurably improve sighting speed, accuracy, handling, and low‑light usability for everyday carry. Evidence: adding a correctly mounted micro‑red dot turns the MOS advantage into faster target acquisition, upgraded sights provide a reliable backup and better sight picture, a refined trigger or connector sharpens shot control, extended/baseplate magazines improve purchase and reload ergonomics, and a compact weapon light or laser enhances identification and aiming in dim conditions.
What are the best Glock 43X MOS accessories?
To enhance the performance of the 43X MOS, consider the following upgrades.
- Micro Red Dot Optic: Holosun 507K or Shield RMSc for rapid target acquisition.
- Trigger Upgrade: Apex Tactical or Overwatch Precision for a crisper break.
- Extended Magazine Release: Improves reload speed and ergonomics.
- Weapon Light: Streamlight TLR-7 Sub for enhanced low-light usability.
- Sights: Steel night sights or fiber optic upgrades for improved accuracy.
All enhancements should complement the pistol’s compact form, especially for those prioritizing concealed carry.
How to Choose the Best Holster for Glock 43X MOS?
Choosing the right Glock 43X MOS holster is essential for safe, comfortable, and effective concealed carry. Because the 43X MOS pairs a slim, single-stack grip with an optics-ready slide, your holster needs secure retention, full trigger-guard coverage, a smooth draw, and precise molding for the MOS footprint (or space for common red-dot plates) — all without ruining the pistol’s concealability. Whether you carry inside the waistband, outside the waistband, or in a shoulder rig, make sure the holster accommodates the 43X MOS’s shorter slide, potential suppressor-height sights, and the optic/plate profile you plan to use. We have a dedicated Best Glock 43X Mos Holsters Guide for you.
Craft Holsters offers a range of holsters made specifically for the Glock 43X MOS, including premium leather options that are hand-crafted to match the pistol’s dimensions and MOS configuration. Each holster is built to improve safety, drawing consistency, and everyday comfort while keeping the profile slim for concealed carry.
What are the best Glock 43x MOS concealed carry holsters?
- Best Glock 43X MOS IWB Holster: The Leather IWB Holster with Steel Clip by Craft Holsters offers an ideal blend of concealability and comfort. Its leather construction molds to the body, while the reinforced opening allows easy reholstering. It's compatible with optics and comes with an adjustable cant for personalized positioning.
- Best Glock 43X MOS OWB Holster: The Open Top Leather Belt Holster from Craft Holsters is a reliable OWB solution that hugs the body tightly enough for concealed use under a light jacket. Hand-molded to fit the 43X MOS with or without optics.
- Best Glock 43X MOS Shoulder Holster: For deeper concealment or extended wear, the Leather Shoulder Holster System by Craft Holsters offers excellent comfort and adjustability. It balances the firearm with a spare magazine pouch, ideal for travel or long hours of carry.
Why choose Glock 43X MOS over other handguns?
Choose the Glock 43X MOS when you want an ultra-concealable pistol that’s already set up for a micro‑red dot—its slim 1.10" Slimline frame and 10+1 single‑stack capacity make it far easier to carry all day than bulkier compacts, while the factory‑milled MOS slide lets you fit a micro‑dot without gunsmithing; combine that with Glock’s proven reliability, light unloaded weight, and wide aftermarket support, and you get a compact defensive handgun that balances concealability, shootability, and modern optics readiness better than many alternatives.
How does Glock 43X MOS differ from Glock 43X?
The most significant difference is the optic-ready slide on the MOS variant. While both share the same frame, grip, and dimensions, the MOS model provides the flexibility of red dot mounting. Additionally, the MOS version includes a slim accessory rail, unlike the standard Glock 43X.
How does Glock 43X MOS differ from Glock 19?
The Glock 43X MOS is slimmer, shorter, and lighter, making it superior for concealed carry. The Glock 19, on the other hand, offers a larger 15+1 capacity and a full accessory rail but is bulkier and heavier. The 43X MOS strikes a better balance for EDC, while the 19 is more suited for duty or home defense.
Frequently Asked Questions about Glock 43X MOS
This FAQ provides concise answers to the most common questions about the Glock 43X MOS. It covers core topics like specs, suitability for concealed carry, optic and holster compatibility, magazine capacity, and practical maintenance tips so you can quickly decide whether the 43X MOS fits your carry needs.
Yes. The 43X MOS is one of the most versatile subcompacts, offering Glock reliability, concealability, and modern optics compatibility in one package.
Yes. Its slim profile, manageable dimensions, and lightweight build make it exceptionally well-suited for concealed carry.
The Glock 43X MOS is chambered in 9mm.
It holds 10 rounds in the magazine plus 1 in the chamber. Aftermarket options like Shield Arms S15 can increase this capacity to 15.
The pistol measures 6.5 inches in overall length, 5.04 inches in height, and 1.10 inches in width, ideal for concealed carry.
Glock 43X MOS is the better pick if you prioritize the slimmest, easiest‑to‑carry optics‑ready 9mm with a very short grip footprint, while the SIG P365 XL is better if you want higher standard capacity, a slightly longer barrel, and a chunkier grip for improved shootability
Not always. Due to the MOS cut and potential optic height, many Glock 43X holsters may not accommodate the MOS variant. Choose holsters specifically molded for the 43X MOS.
Conclusion - Is Glock 43X MOS worth it?
Yes — the Glock 43X MOS is worth it. The 43X MOS packs a practical set of specifications (9mm, 3.41" barrel, 10+1 capacity, ~18.6 oz unloaded and a factory‑milled MOS slide) into a very slim, easy‑to‑carry package; it delivers dependable Glock reliability and controllable recoil, and the optics‑ready slide materially improves target acquisition and accuracy when fitted with a micro‑red dot. Priced in the mid‑range for modern carry pistols (roughly $550–$750 street), it offers strong performance for the money when you factor in concealability, shootability, and aftermarket support.
This pistol is the right choice for everyday carriers who prioritize minimal print, lightweight carry, and the option to mount a micro‑dot without gunsmithing; it’s less ideal for shooters whose top priority is maximum magazine capacity. Finally, the 43X MOS becomes an even better option when paired with the right Glock 43X MOS holster that protects the optic, ensures secure retention, and preserves draw ergonomics for real‑world carry.
