The Glock 43X MOS is a semi-automatic subcompact pistol chambered in 9mm with a 3.41-inch barrel. It has an MOS-cut slide for optic mounting and ships with an Aimpoint COA 3.5 MOA Red Dot already installed. Capacity is 10+1 and the frame has a textured polymer grip. 
 

Key Specifications 

• Brand: Glock 
• Model: 43X MOS 
• Caliber: 9mm 
• Action: Semi Auto 
• Barrel Length: 3.41 in 
• Color/Finish: Black 
• Capacity: 10+1 
   

Detailed Features 

• 3.41-inch barrel 
• MOS cut slide for optic mounting 
• Aimpoint COA 3.5 MOA Red Dot included 
• 10+1 capacity 
• Textured polymer grip frame

Glock 43X MOS owners with the Aimpoint COA package generally view this as a practical compact optic carry setup. The 3.5 MOA dot is considered a quality factory pairing, above the average for bundled optics at this price tier. The 43X frame draws consistent praise for its grip length and width relative to carry concealment.

The 9mm chambering and 10+1 capacity are common comparison points against competing subcompact platforms. Some owners who use the 43X MOS for home defense find the 10+1 limiting and run extended magazines. The MOS cut is viewed positively even by those who end up swapping the Aimpoint for a different compatible optic, since the platform accepts a range of footprint options.

A practical concern owners flag is holster selection with the Aimpoint COA mounted. The added optic height changes the draw profile, and not all holsters accommodate it cleanly. Owners who match the holster to the optic configuration tend to resolve this without issue. Reliability feedback on the 43X MOS is consistently positive.