The GLOCK G34 GEN4 MOS is a competition-ready pistol built for shooters who demand precision and modularity. Its extended slide and barrel provide superior sight radius and velocity, while the Modular Optic System (MOS) platform allows direct mounting of popular red dot sights without custom machining. This model has been on our shelves since fall 2025 with a remarkably low return rate—customers consistently get exactly what they expect from this purpose-built firearm.
Key Features
- MOS (Modular Optic System) Platform: Factory-milled slide accepts multiple optic footprints using included adapter plates.
- Competition-Ready Barrel: Extended 5.31-inch barrel with polygonal rifling enhances accuracy and muzzle velocity.
- GEN4 Enhancements: Includes interchangeable backstraps, reversible magazine catch, and improved dual recoil spring assembly.
- Extended Controls: Ambidextrous slide stop lever and enlarged magazine catch for faster manipulation.
- Adaptable Grip: Rough-textured frame with modular backstraps accommodates various hand sizes.
Specifications
| Caliber | 9x19mm |
| Barrel Length | 5.31 inches |
| Overall Length | 8.82 inches |
| Height | 5.47 inches |
| Width | 1.18 inches |
| Weight (measured) | 0.9 oz |
| Magazine Capacity | 17 rounds (standard) |
| Sight System | Adjustable rear, polymer front (MOS cut) |
Frequently Asked Questions
What optics are compatible with the MOS system?
The GLOCK MOS platform uses adapter plates to accommodate popular optics including Trijicon RMR, Leupold DeltaPoint Pro, Vortex Viper, and others. Four plates are included with the pistol.
Is this model suitable for USPSA or IDPA competition?
Yes, the G34 GEN4 MOS is widely used in USPSA Production and Carry Optics divisions, and IDPA SSP and ESP categories. Its extended sight radius and optic-ready design provide a competitive edge.
Why do customers frequently purchase a second one?
Our staff notes this as one of our most-reordered items. Shooters often acquire a second identical G34 for dedicated training setups, backup competition use, or to maintain consistent performance across multiple configurations.
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