The Glock 43X MOS is a compact, single-stack 9mm pistol built on the Slimline frame and cut for the Modular Optic System so a compatible micro red dot can be mounted directly to the slide. This example carries a Copper Patina custom slide finish over the standard nDLC coating. It has a 3.41-inch GLOCK Marksman Barrel and ships with two 10-round magazines. 
 

Key Specifications 

• Brand: Glock 
• Model: 43X MOS 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 10+1 Rounds 
• Barrel Length: 3.41" 
• Slide Finish: nDLC, Copper Patina 
   

Detailed Features 

• MOS slide cut accepts a compatible micro red dot optic 
• 3.41-inch GLOCK Marksman Barrel (GMB) for accuracy-focused performance 
• Fixed front and rear iron sights usable with or without an optic mounted 
• Copper Patina custom finish over the nDLC-coated slide for a distinct look 
• Reversible magazine catch and two included 10-round magazines 
• Slimline grip designed for concealed carry

The Glock 43X MOS is a common pick for shooters who want a Glock they can carry daily but still mount a red dot on. Reliability is the theme owners bring up most: the pistol is widely trusted to run without babying, which is the main reason people stick with Glock for a carry gun in the first place.

Ergonomics get generally good marks for a single-stack pistol; the Slimline grip conceals easily, though some larger-handed shooters find the grip short and add an extended magazine or basepad for a fuller hold. The MOS cut is popular for adding a micro red dot without sending the slide out for milling, and the factory sights still work as a backup once an optic is mounted.

On value, the 43X MOS holds its price well on the used market and has broad aftermarket support for holsters, sights, and triggers, which is typical for the platform. The Copper Patina finish is more of a cosmetic draw than a functional one, and owners who want it mainly cite the look rather than any performance difference over a standard black slide.