The Glock 43X MOS is a striker-fired 9mm Luger semi-automatic pistol that pairs a compact-size grip with a subcompact-width slide. It has a 3.4-inch barrel, ships with two 15-round magazines, and its slide is cut for mounting a red dot sight once a compatible adapter plate is added. The polymer frame carries an integral accessory rail. 
 

Key Specifications 

• Brand: Glock 
• Model: 43X MOS 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 15+1 
• Barrel Length: 3.4 inches 
• Frame Material: Polymer 
• Slide Finish: nDLC 
   

Detailed Features 

• The MOS-cut slide accepts popular mini red dot sights once a compatible adapter plate is fitted; plates are sold separately. 
• Three internal safeties, covering the trigger, firing pin, and striker, release in sequence during the trigger pull and reset when the shooter lets go. 
• An accessory rail on the polymer frame accepts compact lights and lasers sized for the subcompact-width slide. 
• The extractor doubles as a loaded chamber indicator, giving a visual and physical check of a chambered round. 
• The pistol ships with two magazines, a magazine loader, a cleaning kit, a case, and a lock; adapter plates for the optic cut are not included.

The Glock 43X MOS gets consistent praise for how it carries: the slim, single-stack-width slide over a slightly longer grip makes it comfortable for owners who want more rounds on board than a true subcompact without the bulk of a double-stack. The nDLC slide finish holds up well against holster wear in most owner reports.

Trigger feel is a common talking point. Some owners are happy with the stock Glock trigger straight out of the box, while others plan on an aftermarket trigger to get a shorter, lighter pull for a carry gun. The MOS optic cut is generally well liked, though a few owners mention that sourcing the right adapter plate for their specific red dot takes an extra step and purchase.

On value, the 43X MOS is often compared to other slim nine-millimeter carry pistols, and Glock's reputation for parts availability and reliability tends to be cited as a reason owners choose it over less established brands. The included case, cleaning kit, and spare magazine are usually seen as a reasonable set of extras for the price.