The Glock G43X MOS is a compact 9mm pistol with a 3.41-inch barrel, the Glock Marksman Barrel for improved accuracy, and an MOS-cut slide for direct red dot mounting. It runs on a striker-fire mechanism and ships with fixed sights. The frame is polymer with a black nDLC-coated slide. 
 

Key Specifications 

• Brand: Glock 
• Model: G43X MOS 
• Caliber: 9mm Luger (9x19 Para) 
• Action Type: Striker Fire 
• Capacity: 10+1 rounds 
• Barrel Length: 3.41 inches 
• Overall Length: 6.5 inches 
• Weight: approximately 22.96 oz (1.1 lbs) 
• Frame Material: Polymer 
• Finish: Black nDLC on slide, black on frame 
• Sights: Fixed sights 
   

Detailed Features 

1. Modular Optics System (MOS): The slide is pre-cut for red dot sights, allowing direct mounting without adapter plates. 
2. Glock Marksman Barrel (GMB): The GMB has tighter tolerances than earlier Glock barrels, which translates to improved accuracy, especially with quality ammunition. 
3. Slim Frame Profile: The grip is narrow enough for comfortable daily carry in an IWB or appendix holster. 
4. Lightweight Build: At just over 1 lb, it carries easily throughout the day. 
    

Usage Scenarios 

• Everyday concealed carry where the slim profile and light weight are priorities. 
• Shooting applications where the MOS optics cut allows red dot use for faster target acquisition. 
• Home defense with a gun that's also suitable for daily carry.

The G43X MOS gets strong marks across most user categories. The combination of compact size, MOS optics capability, and Glock reliability is the core appeal, and most owners report the gun delivers on all three.

The MOS optics system is frequently cited as a key advantage. Being able to add a red dot without extensive modification is a genuine selling point, and the range of compatible sights is well-regarded. Reliability is consistent with Glock's reputation, very few malfunctions reported across a wide user base.

The slim grip profile gets praise for carry comfort. The Glock Marksman Barrel is noted as an improvement over older Glock barrels in terms of accuracy.

Capacity is the most common complaint. 10 rounds is lower than some competing compact pistols. Ergonomics draw mixed reactions; most users find the grip comfortable, but some report that rapid-fire sequences feel less controlled compared to guns with more aggressive texturing. Trigger preferences vary, as always with Glock. Some users run it stock, others upgrade immediately. Aftermarket support is extensive.

The Glock 43X might be my favorite concealed carry Glock to date. I remember the first time I shot it at the range (after transitioning out of the Marine Corps, where I carried the 1911); it felt like a perfect blend of compact and full-size. The slim profile made it comfortable to wear all day, but it handled like a much bigger gun. Out of the box, the 10+1 capacity was solid, but once I added the Shield Arms 15-round mag, it felt like a game-changer, now I was carrying Glock 19 capacity in a slim, compact frame. The grip texture was just right, comfortable but firm, without needing any modifications. Shooting the 43X felt natural. The longer grip and shorter slide gave it a balanced feel that pointed quickly and made follow-up shots smooth. The trigger surprised me; a crisp break with a solid reset, and it only got better the more I used it. I went with the MOS version, so mounting my SureFire XSC was a breeze, and the suppressor-height sights were perfect for co-witnessing with my red dot. In terms of carry, the 43X checks all the boxes, concealable, reliable, and accurate. If you're looking for a compact carry that doesn’t sacrifice performance, the 43X is a serious contender.