The Glock 43X Just Received A Big Update

Published on September 11, 2025
Duration: 5:54

This guide details the updated optic mounting system on the Glock 43X MOS, specifically the Coyote/FDE variants. The new design features two screw posts, allowing direct, flush mounting of popular optics like Holosun K-series and Vortex Defender models without the need for milling or adapter plates. This simplifies installation and improves optic stability.

Quick Summary

The Glock 43X MOS has received a significant update to its optic mounting system, especially on FDE/Coyote models. The new design replaces the original four 'bosses' with two screw posts, enabling direct, flush mounting of popular optics like the Holosun K-series and Vortex Defender models without milling or adapter plates.

Chapters

  1. 00:00Introduction & Giveaway
  2. 01:04Glock 43X MOS Footprint Update
  3. 01:26Optic Compatibility Explained
  4. 02:13Comparison with Original MOS
  5. 04:04Technical Advantages of New System
  6. 04:48Vortex Day Event Announcement

Frequently Asked Questions

What is the main update to the Glock 43X MOS slide?

The Glock 43X MOS slide, particularly on newer FDE/Coyote models, has been updated with a new optic mounting system. It now features two screw posts instead of the original four 'bosses', allowing for direct, flush mounting of compatible optics without adapters.

Which optics are compatible with the updated Glock 43X MOS slide?

The updated slide directly fits optics with a Modified Shield RMSc footprint, such as the Holosun 507K, EPS Carry, SCS Carry, and the Vortex Defender ST and CCW models. This simplifies installation significantly.

What are the benefits of the new Glock 43X MOS optic mounting system?

The new system provides a more secure and stable optic mount by allowing direct contact with the slide. It offers better thread engagement for mounting screws and eliminates the need for milling or adapter plates, resulting in a lower profile and potentially improved durability.

How does the new Glock 43X MOS optic footprint differ from the original?

The original black Glock 43X MOS slide used a system with four 'bosses' that often required milling or adapter plates for specific optics. The updated FDE/Coyote version uses a simpler two-post screw system designed for direct mounting of RMSc-footprint optics.

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