Scope Mount Finder

Can you run a Viridian RFX-25 on a 20 mm RIS or RIS II airsoft rail? Yes, through its Docter/Noblex-footprint Picatinny mount. The Picatinny-pattern fit and the clone-rail tolerance to check.

Updated 05 September 2026.

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

Fit a Viridian RFX-25 on an airsoft RIS rail

The Viridian RFX-25 is a Docter / Noblex optic. Here is how it clamps a 20 mm airsoft RIS rail and the one thing to check on a clone rail.

Direct fitThe Viridian RFX-25 runs on a 20 mm RIS or RIS II airsoft rail through its Docter/Noblex-footprint Picatinny mount, exactly as on a live-fire Picatinny rail. On a good replica rail it clamps square; on a cheap clone rail, seat it dry first and confirm it locks, because clone rails can sit out of Picatinny spec.
OpticViridian RFX-25Docter / Noblex
seats on
RailAirsoft 20 mm RIS / RIS II railPicatinny-pattern; check clone tolerance
Fit readoutBench figures
Fitment
Optic type
open-emitter reflex
Mount
Docter/Noblex-footprint Picatinny mount
Mount the Viridian RFX-25 on airsoft
Shop Docter / Noblex Picatinny mount for airsoft on AmazonaffiliateFind Docter / Noblex Picatinny mount for airsoft on eBayaffiliateShop Docter / Noblex riser mount on AmazonaffiliateFind Docter / Noblex riser mount on eBayaffiliate

A 20 mm RIS or RIS II airsoft rail is built to the Picatinny pattern, so the Docter/Noblex-footprint Picatinny mount that carries the Viridian RFX-25 on a live-fire rail clamps the replica rail the same way. The footprint choice does not change: it is still a Docter / Noblex optic on a Docter / Noblex mount.

The variable on airsoft is the rail, not the sight. A quality RIS or RIS II rail holds Picatinny slot width and pitch, but a budget clone rail can run slightly narrow or wide. Seat the mount dry, check the Viridian RFX-25 sits square, and confirm the clamp locks before a skirmish so recoil-free cycling does not shake it loose.

Related fitments

Questions and answers

Fit a Viridian RFX-25 on an airsoft RIS rail?

The Viridian RFX-25 runs on a 20 mm RIS or RIS II airsoft rail through its Docter/Noblex-footprint Picatinny mount, exactly as on a live-fire Picatinny rail. On a good replica rail it clamps square; on a cheap clone rail, seat it dry first and confirm it locks, because clone rails can sit out of Picatinny spec.