The GLOCK G34 GEN4 MOS is a competition-ready pistol designed for shooters who demand accuracy and modularity. This long-slide 9mm features the Modular Optic System (MOS) for easy red dot mounting, making it ideal for USPSA, 3-Gun, or duty use. Since we started stocking it in summer 2025, it has become one of our most reliable sellers in the competition category, consistently performing without issue.
Key Features
- MOS (Modular Optic System): Factory-milled slide accepts a wide range of popular micro red dot sights without requiring custom machining.
- Competition-Ready Barrel & Sight Radius: The extended 5.31-inch barrel and long sight radius provide enhanced accuracy and a flatter shooting experience.
- GEN4 Enhancements: Features interchangeable backstraps for customizable grip size and the dual recoil spring assembly for reduced felt recoil.
- Reliable Performance: Our staff testing confirms it runs flawlessly with standard 115gr and 124gr ammunition.
- Ample Capacity: Ships with two standard 17-round magazines, with compatibility for higher-capacity options.
Specifications
| Model | G34 GEN4 MOS |
| Caliber | 9x19mm |
| Barrel Length | 5.31 inches |
| Overall Length | 8.82 inches |
| Weight (measured) | 0.8 oz |
| Sights | Factory adjustable rear, polymer front |
| Frame Finish | Black polymer |
| Slide Finish | nDLC |
Frequently Asked Questions
What optics plates are included?
The pistol ships from the factory with four adapter plates (RMSc, C-MORE, Doctor, and Leupold Delta Point Pro footprints) to mount most popular micro red dots directly to the MOS system.
How does it handle different ammunition?
Based on our staff’s experience, this G34 runs exceptionally well with 115gr and 124gr range ammunition. We noted one hiccup during testing with a specific brand of 147gr subsonic rounds, but it has been flawless with all other loads.
Is this model California compliant?
No, the GLOCK G34 GEN4 MOS is not on the California Roster of Handguns Certified for Sale and is not available for sale to residents of California.
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