Glock 34 Gen 5 MOS

Product Description

The Glock 34 Gen 5 MOS is a semi-auto striker-fired pistol designed for competitive shooting and built on Glock’s Modular Optic System platform. The MOS configuration allows you to mount a wide range of reflex sights directly to the slide without aftermarket machining. This model combines the longer sight radius of the 34 platform with the Gen 5 trigger and control upgrades.

Shooters choose the Glock 34 Gen 5 MOS when they need a competition-ready platform that accepts optics out of the box. The extended slide and integrated mounting system make it a solid choice for USPSA, Steel Challenge, and range work where speed and accuracy both matter.

Key Facts

• Model: Glock 34 Gen 5 MOS
• Action: Semi-Auto, Striker Fired
• Brand: GLOCK
• SKU: GLPA343S103MOS

What MOS Means for the Glock 34

The Modular Optic System lets you mount reflex sights from multiple manufacturers using adapter plates. The slide is cut and drilled at the factory, so you skip the custom milling step that once added cost and turnaround time. Common optics that fit the MOS footprint include models from Trijicon, Holosun, Leupold, and others.

Plate kits and compatibility vary, and it’s worth knowing before you buy the optic.

How the Gen 5 Differs from Gen 4

Gen 5 Glocks dropped the finger grooves on the front strap and added ambidextrous slide stop levers. The trigger itself saw updates to reduce pre-travel. The flared magwell on the 34 helps with fast reloads under a timer.

If you’ve run a Gen 4 Glock 34, the Gen 5 feels familiar but slightly more neutral in the hand. Shooters with smaller hands often prefer the smoother grip texture and the ability to position their fingers without fighting molded grooves.

Gen 5 vs Gen 3 Glock 34

The Gen 3 Glock 34 remains popular in some competitive divisions and with departments that standardized on Gen 3 parts. Gen 5 adds the MOS cut, the updated trigger, and the reversible magazine catch. Gen 3 uses the older trigger bar and lacks the optics mounting option unless you send the slide out for machining.

Both generations share the same basic striker-fired operation and barrel length, so accuracy potential is similar. The choice often comes down to whether you need factory optics mounting or prefer the aftermarket support and lower cost of Gen 3 parts.

Ordering from Western Sport

Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: What optics fit the Glock 34 Gen 5 MOS?

A: The MOS system accepts reflex sights that match the Glock MOS footprint or use the included adapter plates. Common brands include Trijicon RMR, Holosun 507C and 508T, and Leupold DeltaPoint Pro. Send us a message to confirm which plates ship with this pistol and which optic you have in mind.

Q: Is the Glock 34 Gen 5 MOS legal in Texas?

A: Yes. Semi-auto pistols like the Glock 34 Gen 5 MOS are legal to own in Texas for residents who pass a background check and meet federal eligibility requirements.

Q: How does the Glock 34 differ from the Glock 17?

A: The Glock 34 uses a longer slide and barrel than the Glock 17, which extends the sight radius and reduces muzzle flip. Both models share the same frame size and similar grip angle. Competitive shooters favor the 34 for the added length, while concealed-carry users typically choose the 17 or smaller models.

Q: Can I use Glock 17 magazines in the Glock 34 Gen 5?

A: Glock magazines that fit the Glock 17 frame will typically fit the Glock 34, as both share the same frame and magazine well dimensions. Confirm magazine compatibility and capacity with the manufacturer or send us a message for guidance on what works with this model.

Q: What is the trigger pull like on the Gen 5?

A: Gen 5 Glock triggers feature reduced pre-travel and a slightly crisper break compared to Gen 4 and Gen 3 models. The striker-fired design means there is no external hammer, and the trigger resets after every shot. Exact pull weight should be confirmed with Glock or measured with a trigger gauge.

Additional information