How to Install the OSight C Red Dot on Your Glock (Quick Tutorial)

Published on November 26, 2025
Duration: 0:41

This guide details the installation of the Olight OSight C red dot sight on a Glock pistol. It covers the necessary RMR footprint compatibility, adapter plate installation with specific torque values (12-13 in-lbs), and optic mounting to either the plate (15 in-lbs) or a direct-milled slide (17 in-lbs) using a T10 Torx bit. The instruction emphasizes proper torque specifications and thread locker application for a secure optic mount.

Quick Summary

The Olight OSight C red dot sight uses the RMR footprint. Installation requires either an RMR-milled slide or a Glock MOS to RMR adapter plate. Use blue thread locker on adapter plate screws and torque to 12-13 in-lbs. Mount the optic using the provided screws, torquing to 15 in-lbs for adapter plates or 17 in-lbs for direct slide mounts, using a T10 Torx bit.

Chapters

  1. 00:00Footprint and Compatibility
  2. 00:09Hardware Requirements
  3. 00:13Adapter Plate Installation
  4. 00:22Optic Mounting and Torque Specs

Frequently Asked Questions

What footprint does the Olight OSight C use for mounting?

The Olight OSight C red dot sight utilizes the Trijicon RMR footprint. This means it requires either a slide milled specifically for the RMR footprint or the use of an adapter plate, such as a Glock MOS to RMR adapter.

What are the correct torque specifications for installing the Olight OSight C on a Glock?

When mounting to an adapter plate, torque the optic screws to 15 inch-pounds. If mounting directly to a slide milled for the RMR footprint, torque the screws to 17 inch-pounds. Adapter plate screws should be torqued to 12-13 inch-pounds.

What tools and materials are needed to install the Olight OSight C?

You will need a torque driver capable of measuring inch-pounds, a T10 Torx bit, and blue medium-strength thread locker for the adapter plate screws. The optic screws often come pre-applied with Loctite.

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