P320 X-Five Legion Co-Witness w/Romeo Red-Dot (PS: SIG SUCKS!)

Published on October 25, 2019
Duration: 6:40

This guide details the process of removing the rear sight plate from a SIG P320 X-Five Legion, a necessary step for mounting red dot sights. The video highlights that the plate is not obviously removable and requires accessing screws from the bottom of the slide. It also addresses the compatibility issues between older Romeo red dots and newer SIG P320 models, noting that while co-witnessing is possible with the front sight, direct mounting of certain Romeo models is not supported without adapter plates or newer optics.

Quick Summary

To remove the rear sight plate on a SIG P320 X-Five Legion for optic mounting, access the securing screws from the bottom of the slide. The SIG Romeo 1 red dot sight co-witnesses with the front iron sight. However, newer P320 models have changed screw hole patterns, making older Romeo optics incompatible without adapters.

Chapters

  1. 00:13Intro & Email Question
  2. 00:35Why Remove Rear Sight Plate?
  3. 00:41Co-Witness Question: Romeo Red Dot
  4. 01:38Removing the Rear Sight Plate
  5. 02:02Accessing Screws from Bottom
  6. 02:21Sliding Plate Off
  7. 03:16Reassembly of Plate
  8. 03:37Initial Fitment Expectation
  9. 03:51Problem Encountered: Incompatibility
  10. 04:24SIG's Response & New Optics
  11. 05:14Decision Not to Mount Red Dot
  12. 05:50Confirming Co-Witness
  13. 06:11Summary & SIG Criticism

Frequently Asked Questions

How do you remove the rear sight plate from a SIG P320 X-Five Legion?

To remove the rear sight plate from a SIG P320 X-Five Legion, ensure the firearm is unloaded. You'll need to access the securing screws from the bottom of the slide. This may involve removing a small plunger that obstructs one of the screw holes. Once the screws are removed, the plate can be slid off.

Does a SIG Romeo red dot sight co-witness with the standard front sight on a P320 X-Five Legion?

Yes, the SIG Sauer Romeo 1 red dot sight, when mounted on a SIG P320 X-Five Legion after removing the rear sight plate, does co-witness with the standard front iron sight. This allows for backup sighting if the red dot fails.

Are SIG Romeo red dots compatible with all SIG P320 models?

No, SIG Sauer has altered the screw hole configurations on newer P320 models, making older Romeo red dots incompatible without adapter plates or specific mounting solutions. The Romeo 1 Pro is designed for these newer interfaces.

What is a potential drawback of removing the rear sight plate on a SIG P320 X-Five Legion?

A drawback of removing the rear sight plate on the SIG P320 X-Five Legion is that you will lose the small, integrated Legion symbol that is part of the original plate.

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