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How to mount a Trijicon RMRcc 3.25 MOA on a Weaver base: it is a Trijicon RMRcc open-emitter reflex, so it needs a Weaver-compatible Trijicon RMRcc mount, not a Picatinny one.

Updated 05 September 2026.

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Fit a Trijicon RMRcc 3.25 MOA on a Weaver base

The Trijicon RMRcc 3.25 MOA is a Trijicon RMRcc optic. Here is the Weaver-compatible mount it needs and why a Picatinny footprint mount may not seat on a Weaver slot.

Direct fitThe Trijicon RMRcc 3.25 MOA reaches a Weaver base through a Weaver-compatible RMRcc-footprint Picatinny mount. A Picatinny version of the same footprint mount may not seat, because its 5.23 mm recoil lug can be too wide for the 4.57 mm Weaver slot. Buy the Weaver-cut mount, or fit a Picatinny base first.
OpticTrijicon RMRcc 3.25 MOATrijicon RMRcc
seats on
RailWeaver rail4.57 mm slot, narrower than Picatinny
Fit readoutBench figures
Fitment
Optic type
open-emitter reflex
Mount
Weaver-compatible Trijicon RMRcc mount
Dot size
3.25 MOA
Mount the Trijicon RMRcc 3.25 MOA on Weaver
Shop Weaver-compatible Trijicon RMRcc mount on AmazonaffiliateFind Weaver-compatible Trijicon RMRcc mount on eBayaffiliateShop Weaver to Picatinny adapter base on AmazonaffiliateFind Weaver to Picatinny adapter base on eBayaffiliate

The Trijicon RMRcc 3.25 MOA is a Trijicon RMRcc optic, so it needs a Trijicon RMRcc mount. On a Weaver base that mount has to be a Weaver-compatible version: Weaver slots are narrower and spaced differently from Picatinny, so a full-width Picatinny recoil lug may not drop in.

If the only Trijicon RMRcc mount you can find is Picatinny-cut, the cleaner fix is to replace the Weaver base with a Picatinny rail, then use the standard Trijicon RMRcc Picatinny mount. Check the mount clamps square before locking it down.

Related fitments

Questions and answers

Fit a Trijicon RMRcc 3.25 MOA on a Weaver base?

The Trijicon RMRcc 3.25 MOA reaches a Weaver base through a Weaver-compatible RMRcc-footprint Picatinny mount. A Picatinny version of the same footprint mount may not seat, because its 5.23 mm recoil lug can be too wide for the 4.57 mm Weaver slot. Buy the Weaver-cut mount, or fit a Picatinny base first.