Optics ready plates for Glock 21 MOS [gen 4/5]

This collection contains optic plates for the Glock 21 MOS. The plate goes into the factory optic cut and takes the red dot on top. We have plates for the Trijicon RMR, Shield RMSc, Holosun K-series, Leupold DPP, Docter, C-More RTS, Aimpoint Acro and Holosun 509T footprints, made by 2BME, Eemann Tech, Holosun, KMR, Shield Sights and Toni System.

Choose the plate by the footprint of your red dot and check that your model is named in the title. You find a full guide to these plates, their footprints, materials and installation in Optics ready plates for Glock 17 MOS [gen 4/5].

Plates at a glance

Frequently asked questions

Can I install an optic plate on my Glock 21 MOS at home?

Yes. Remove the cover plate from the optic cut, screw the plate in and screw the red dot onto it. Put a drop of threadlocker on every screw. No milling and no gunsmith are needed.

Which red dots will fit my Glock 21 MOS?

It depends on the plate you choose. The plates here take the Trijicon RMR, Shield RMSc, Holosun K-series, Leupold DPP, Docter, C-More RTS, Aimpoint Acro and Holosun 509T footprints. Find the footprint of your red dot in its specifications and take the plate with the same footprint.