The EGW Trijicon RMR sight mount (EGW part no. 49521) is a direct dovetail replacement that lets you run a Trijicon RMR reflex sight on your Ruger Mark IV/Mk I-III, P85 and P90. It installs in place of the factory rear sight, so the red dot sits at the correct height and position for a proper co-witness with your stock irons where the platform allows it. Whether you carry this pistol for concealed carry, home defense, or duty use, a slide-mounted reflex sight speeds up your first shot and keeps both eyes open for target acquisition. EGW builds these mounts specifically for this pistol’s dovetail geometry rather than a one-size-fits-all plate, so fitment stays tight and repeatable.

Key Specifications

• Machined to accept the Trijicon RMR reflex sight footprint, so the optic seats directly on the mount without a separate adapter plate.
• Direct fit for the Ruger Mark IV/Mk I-III, P85 and P90, replacing the factory rear sight dovetail on this specific platform.
• Falls in EGW’s Tactical mount category, matching the low-profile design used across this product line.
• Installs as a dovetail-based replacement for the factory sight, keeping the swap straightforward for a gunsmith or experienced owner.
• Sold as a single mount unit, ready to pair with a customer-supplied Trijicon RMR optic.

Frequently Asked Questions

Will this mount fit my Ruger Mark IV/Mk I-III, P85 and P90? Yes, this EGW mount is machined specifically for the Ruger Mark IV/Mk I-III, P85 and P90’s factory rear-sight dovetail.

Does this include the Trijicon RMR optic? No, this listing is the mount only; the Trijicon RMR reflex sight is sold separately.

Buy the EGW Trijicon RMR Sight Mount for Ruger Mark IV/Mk I-III, P85 and P90

Order the EGW Trijicon RMR Sight Mount for Ruger Mark IV/Mk I-III, P85 and P90 through our EGW lineup of scope accessories & scope parts. Ships fast from our Lubbock, Texas gun shop, with fast, insured shipping straight to your door.