The Glock 34 MOS Gen5 is a full-size 9mm pistol built around competition shooting. The 5.31-inch Glock Marksman Barrel gives an extended sight radius and is cold hammer-forged for consistency. The Modular Optics System (MOS) lets you bolt optics directly to the slide using included adapter plates. The gun ships with 3 magazines at 17+1 capacity, weighs 23.46 oz (1.62 lbs), and the frame carries three automatic safeties: trigger, firing pin, and drop. 
 

Key Specifications 

• Model: Glock 34 MOS Gen5 
• Caliber: 9mm Luger (9x19 Para) 
• Barrel Length: 5.31 inches 
• Overall Length: 8.74 inches 
• Weight: 23.46 oz (1.62 lbs) 
• Capacity: 17+1 rounds 
• Action Type: Safe Action (Striker) 
• Finish: Matte Black nDLC 
• Magazines Included: 3 
   

Detailed Features 

Adjustable rear sights let you zero the gun without tools, which is useful for dialing in dot co-witness. The Gen5 flared magwell speeds up reloads. The nDLC finish covers the slide and barrel for corrosion resistance. No finger grooves on the frame compared to earlier generations, which suits a wider range of hand sizes and grip styles.

The Glock 34 Gen5 MOS draws a focused crowd, mostly competition shooters and people who want a longer-barreled 9mm for precision work.

Accuracy is the top positive. The 5.31-inch barrel and sight radius translate to tighter groups than compact or standard-length Glocks, and users running red dots through the MOS report fast, accurate target transitions.

The MOS design gets consistent appreciation. Having factory-supported optic mounting without cutting the slide yourself is a real convenience, and the adapter plate system covers the most common red dot footprints.

Ergonomics are well regarded. Gen5 improvements (no finger grooves, the flared magwell, and better texture) are frequently cited as meaningful upgrades over earlier generations.

Aftermarket support is a strong point. The Glock ecosystem means triggers, sights, and accessories are readily available and well-understood.

Recoil is described as manageable for the size, which matters in competition where follow-up shot speed counts.

On the critical side: size is the primary trade-off. The G34 is not a carry gun, and users who aren't specifically doing competition work sometimes wonder if a G17 or shorter variant would serve them just as well. Trigger feel relative to other competition pistols comes up occasionally as a comparison point.