Scope Mount Finder

How to mount a Viridian RFX-11 on a Weaver base: it is a Shield RMSc open-emitter reflex, so it needs a Weaver-compatible Shield RMSc mount, not a Picatinny one.

Updated 05 September 2026.

Scope Mount Finder / Every rail, tube and red-dot footprint

Fit a Viridian RFX-11 on a Weaver base

The Viridian RFX-11 is a Shield RMSc optic. Here is the Weaver-compatible mount it needs and why a Picatinny footprint mount may not seat on a Weaver slot.

Direct fitThe Viridian RFX-11 reaches a Weaver base through a Weaver-compatible RMSc-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.
OpticViridian RFX-11Shield RMSc
seats on
RailWeaver rail4.57 mm slot, narrower than Picatinny
Fit readoutBench figures
Fitment
Optic type
open-emitter reflex
Mount
Weaver-compatible Shield RMSc mount
Mount the Viridian RFX-11 on Weaver
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The Viridian RFX-11 is a Shield RMSc optic, so it needs a Shield RMSc 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 Shield RMSc mount you can find is Picatinny-cut, the cleaner fix is to replace the Weaver base with a Picatinny rail, then use the standard Shield RMSc Picatinny mount. Check the mount clamps square before locking it down.

Related fitments

Questions and answers

Fit a Viridian RFX-11 on a Weaver base?

The Viridian RFX-11 reaches a Weaver base through a Weaver-compatible RMSc-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.