The Glock G45 Gen5 MOS is a 9mm semi-automatic pistol with a 4.02-inch barrel, 17+1 capacity, and a weight of 24.52 oz. The polymer frame ships in black, and the slide has a Direct ACRO Cut for direct optics mounting without an adapter plate. Fixed suppressor-height sights are standard. No manual safety. Comes with 3 magazines. 
 

Key Specifications 

• Model: G45 Gen5 M.O.S. 
• Type: Semi-Auto Pistol 
• Caliber: 9mm 
• Barrel Length: 4.02 inches 
• Overall Length: 7.28 inches 
• Capacity: 17 + 1 rounds 
• Number of Magazines: 3 
• Weight: 24.52 oz 
• Frame Material: Polymer (Black finish) 
• Sights: Suppressor Height Sights (Fixed) 
• Optics Ready: Yes, with Modular Optics System (Direct ACRO Cut Slide) 
• Safety Features: No Manual Safety 
   

Detailed Features 

1. Direct ACRO Cut Slide: The slide is milled for direct mounting of the Aimpoint ACRO and other compatible optics, which sits lower than a plate-based setup and reduces the red dot height above bore. 
2. Suppressor Height Sights: Fixed sights tall enough to co-witness with a mounted optic or to use with a suppressor. 
3. Ambidextrous Controls: The reversible magazine release and ambidextrous slide stop work for left- and right-handed shooters without modification. 
4. Gen5 Frame: The Gen5 grip removes the finger grooves from earlier generations and adds a flared mag well, which most shooters find easier to manage under speed. 
    

Target Audience 

The G45 MOS fits law enforcement, military users, and competitive shooters who want a full-size grip with a compact slide footprint and optics-ready capability out of the box. It also suits anyone who wants a reliable 9mm with room to add a red dot later. 
 

Usage Scenarios 

• Tactical and Duty Use: The suppressor-height sights and ACRO-ready slide make it practical for duty carry with or without an optic. 
• Competitive Shooting: The 17+1 capacity and optics capability give it room to compete in Production Optics and similar divisions. 

Owners of the Glock G45 Gen5 MOS consistently mention a few recurring points.

The MOS platform and Direct ACRO Cut get strong praise from optics users. Being able to mount an ACRO directly to the slide without a plate is a real-world advantage, and users who run red dots specifically seek out this variant.

Ergonomics are generally positive. The Gen5 grip without finger grooves fits more hand sizes than Gen3 and Gen4 frames, and the flared mag well helps with reloads. These are the most commonly praised changes over older generations.

Reliability gets the expected Glock endorsement. Owners report consistent function across a wide range of 9mm ammunition, and malfunctions are rarely mentioned.

The suppressor-height sights work well for their purpose but some shooters find them a visual distraction without a suppressor or optic mounted.

Size comes up as a concern for carry users. The G45 has a full-size grip, which some shooters find harder to conceal compared to the G19. Those primarily focused on concealed carry often prefer the G19 MOS instead.

Trigger feedback is mixed. Most owners accept the standard Glock trigger, but some who have shot other factory triggers find the reset and feel underwhelming compared to alternatives in the same price range.

Price is occasionally debated. Some buyers feel the cost is appropriate for the MOS feature set; others point to competitors offering optics-ready platforms at lower prices.

Net sentiment is positive, with the optics capability, reliability, and ergonomics cited most often as reasons to buy.