Red dot adapters for Ruger Mark III

This collection brings together every red dot adapter we have for the Ruger Mark III. The Mark III takes two kinds: an optics ready plate that installs on top of the slide, and a red dot mount that replaces the rear sight. Both fit the same model, so you choose by how you want to fit your red dot.

Two ways to fit a red dot on the Ruger Mark III

• Optics ready plate: it installs on top of the slide on the factory interface. The rear sight stays in place. One plate family fits both the Mark III and the Mark IV.
• Red dot mount: it replaces the rear sight. You need no milling and no permanent changes, so you can put the rear sight back at any time. The same mount fits the Ruger Mark models, the P85 and the P97.

Adapters at a glance

Outer Impact and EGW both make their adapters from aluminium in the USA. The type letters differ between makers, so always read the footprints in the brackets.

Which red dot for which footprint

• Trijicon RMR: for example the Holosun 407C, 507C and 508T, Olight Osight and Vector Optics Frenzy-X. See Red dots with Trijicon RMR footprint.
• Shield RMSc: Shield red dots, the Holosun EPS Core, Olight Osight K, S and SE and Vector Optics Frenzy-S. See Red dots with Shield RMSc footprint.
• Holosun K-series: the Holosun 407K and 507K, EPS Carry and SCS Carry. See Red dots with Holosun K-series footprint.
• Leupold DPP: for example the Holosun SCS 320, Olight Osight SE DPP and Vortex Defender ST and XL. See Red dots with Leupold DPP footprint.
• Docter: also called Vortex Venom or Noblex, for example the Vector Optics Frenzy 1x17x24 and Frenzy-X 1x20x28. See Red dots with Docter footprint.
• C-More RTS: the C-More RTS, the Toni System ZR, ZV and ZX and the Vector Optics Frenzy Plus. See Red dots with C-More RTS footprint.

Related collections

For other Ruger models, see Red dot adapters for Ruger models. For the tools you need, see Installation tools.

Frequently asked questions

Do I have to remove the rear sight?

Only for the mount, which takes the place of the rear sight. The plate installs on top of the slide and the rear sight stays where it is.

Can I install it at home?

Yes. No milling is needed, and you can do it yourself.

1. Plate: screw the plate onto the factory interface on top of the slide, then screw the red dot onto the plate.
2. Mount: drift the rear sight out with a sight pusher or a punch, push the mount in and tighten it, then screw the red dot on.

Put a drop of threadlocker on every screw.

Which red dots will fit my Ruger Mark III?

It depends on the plate or mount you choose. Together they take the Trijicon RMR, Shield RMSc, Holosun K-series, Leupold DPP, Docter and C-More RTS footprints. Find the footprint of your red dot in its specifications and take the adapter that names it.

Does the Mark IV plate fit my Mark III?

Yes. The plates are made for both the Mark III and the Mark IV.