Overview Of Glock OEM Gen 3 MOS Spare Slide

The Glock OEM Gen 3 MOS Spare Slide delivers factory-grade performance with an optics-ready design that supports modern red-dot systems. Because Glock machines this slide to exact tolerances, you benefit from consistent reliability and smooth cycling during every use.

Performance

This MOS upper uses durable construction and a high-quality finish that resists wear. Additionally, the slide maintains the classic Gen 3 geometry, which ensures compatibility with standard Glock Gen 3 components and holsters.

Why Choose This Slide

Since the slide includes Glock’s MOS cut, installing optics becomes fast and simple. Moreover, shooters upgrading their pistol or restoring a factory upper assembly will appreciate the OEM fitment and long-lasting dependability the slide provides.

FEATURES

• Factory Glock OEM Gen 3 MOS slide

• MOS optics-ready cut for modern red dots

• Exact Glock machining for optimal fit

• Corrosion- and wear-resistant finish

• Compatible with Glock 19 Gen 3 and MOS plates

• Perfect for replacement builds or OEM upgrades

How to Mount Optics on a Glock Gen 3 MOS Slide 

Mounting an optic on the Glock OEM Gen 3 MOS Spare Slide is simple because the MOS cut accepts multiple plate systems. First, choose the correct MOS plate for your optic model—RMR, SRO, EPS, or DeltaPoint Pro. Then secure the plate to the slide using factory-spec torque values to ensure reliability. Finally, mount your optic to the plate and re-zero your sights after installation to confirm accuracy and alignment.

Complete vs Stripped Glock MOS Slide 

Choosing between a Complete and Stripped Glock Gen 3 MOS slide depends on your build requirements. A Stripped Slide is ideal for custom builds since it arrives bare and ready for your preferred internals. A Complete Slide comes pre-assembled with Glock factory parts, which makes it a fast drop-in option for shooters who want immediate usability and guaranteed OEM reliability.