Description
The GLOCK G34 GEN4 MOS is a purpose-built competition and duty pistol designed for shooters who demand maximum sight radius and optic-ready versatility. Its 5.31″ barrel and MOS (Modular Optic System) slide make it a top choice for USPSA Production, Carry Optics, and tactical applications. We started stocking this model in early 2026, and its consistent performance has made it one of our steady sellers. We now keep over 20 in stock at all times to avoid the backorders that plague this popular model.
Why This One?
- MOS Platform: The factory-machined slide accepts a wide range of popular micro red dot sights without requiring aftermarket milling, ensuring a secure, co-witness-ready mount.
- Competition-Ready Barrel: The extended 5.31″ barrel provides a longer sight radius for improved accuracy and allows for full powder burn, which can increase velocity and reduce muzzle flip.
- GEN4 Enhancements: Features include multiple backstrap options for customizable grip size, a reversible magazine catch for left or right-handed use, and the dual recoil spring assembly for managed recoil impulse.
- Proven Reliability: Built on the legendary GLOCK Safe Action system and the full-size G34 frame, it maintains the durability and dependability required for high-round-count training and competition.
- Immediate Utility: Comes with GLOCK’s standard sights, which are usable while you select an optic, and includes multiple mounting plates to get your preferred red dot installed right out of the box.
Full Spec Sheet
| Model | G34 GEN4 MOS |
| Caliber | 9x19mm |
| Barrel Length | 5.31″ |
| Overall Length | 8.82″ |
| Height | 5.47″ |
| Weight (measured) | 4.9 oz |
| Frame | Polymer |
| Sights | Factory GLOCK Standard Sights |
| Magazine Capacity | 17 Rounds (Standard) |
Q & A
Which red dot optics fit the MOS system?
The GLOCK MOS system uses adapter plates. This pistol includes plates for popular footprints like Trijicon RMR/SRO, Leupold DeltaPoint Pro, C-MORE STS, and Docter/Noblex sights. You must use the correct plate for your specific optic model to ensure a secure fit and proper torque.
Is the G34 GEN4 MOS suitable for concealed carry?
While possible with the right holster and attire, the G34’s extended slide and full-size frame make it primarily a competition, duty, or home defense firearm. Its size is optimized for performance, not concealment.
What is the main advantage of the longer slide and barrel?
The primary benefits are increased sight radius for more precise iron sight alignment and potentially higher muzzle velocity. The longer slide also adds mass out front, which can help mitigate muzzle rise for faster follow-up shots.
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