The Glock 43X MOS is a 9mm striker-fired pistol built on Glock's Slimline single-stack frame, with factory MOS slide cuts that accept compatible micro red dot optics. It uses the match-grade GLOCK Marksman Barrel (GMB) with a 3.41-inch barrel length, finished in a Diamond Glitter nDLC slide treatment. The compact grip and 10+1 magazine capacity keep the pistol sized for everyday carry, and 2-dot sights and front slide serrations round out the factory configuration. 
 

Key Specifications 

• Brand: Glock 
• Model: 43X MOS 
• Caliber: 9mm 
• Barrel Length: 3.41 in 
• Finish: nDLC (Diamond Glitter) 
• Grips: Polymer 
   

Detailed Features 

• MOS slide cuts accept compatible micro red dot optics 
• GLOCK Marksman Barrel (GMB) for consistent shot placement 
• Slimline 10+1 magazine sized specifically for the 43X frame 
• Integrated trigger safety as part of the factory ignition system 
• 2-dot sight configuration with front serrations for slide manipulation

The 43X MOS is popular with owners who want a slim carry gun that still runs a red dot. Reliability comments track with the broader Glock reputation: most owners describe it as running clean with minimal maintenance, and the GLOCK Marksman Barrel gets credit for making the pistol easy to shoot accurately for its size.

Carry comfort is the biggest draw. The single-stack Slimline grip conceals well under a shirt, and the added grip length over the standard 43 gives most hands a fuller purchase without adding much bulk. A few owners with larger hands still find the grip short for a two-hand hold.

The MOS cut opens up aftermarket optic choices, and holster options for the 43X are plentiful given how common the platform has become. Some owners note that a flashy slide finish like Diamond Glitter can make replacement parts or refinishing harder to match later.