Scope Mount Finder

Can you run a Holosun HS507C-X2 on a 20 mm RIS or RIS II airsoft rail? Yes, through its RMR-footprint Picatinny mount. The Picatinny-pattern fit and the clone-rail tolerance to check.

Updated 05 September 2026.

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Fit a Holosun HS507C-X2 on an airsoft RIS rail

The Holosun HS507C-X2 is a Trijicon RMR / Holosun C optic. Here is how it clamps a 20 mm airsoft RIS rail and the one thing to check on a clone rail.

Direct fitThe Holosun HS507C-X2 runs on a 20 mm RIS or RIS II airsoft rail through its RMR-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.
OpticHolosun HS507C-X2Trijicon RMR / Holosun C
seats on
RailAirsoft 20 mm RIS / RIS II railPicatinny-pattern; check clone tolerance
Fit readoutBench figures
Fitment
Optic type
open-emitter reflex
Mount
RMR-footprint Picatinny mount
Mount the Holosun HS507C-X2 on airsoft
Shop Trijicon RMR / Holosun C Picatinny mount for airsoft on AmazonaffiliateFind Trijicon RMR / Holosun C Picatinny mount for airsoft on eBayaffiliateShop Trijicon RMR / Holosun C riser mount on AmazonaffiliateFind Trijicon RMR / Holosun C riser mount on eBayaffiliate

A 20 mm RIS or RIS II airsoft rail is built to the Picatinny pattern, so the RMR-footprint Picatinny mount that carries the Holosun HS507C-X2 on a live-fire rail clamps the replica rail the same way. The footprint choice does not change: it is still a Trijicon RMR / Holosun C optic on a Trijicon RMR / Holosun C 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 Holosun HS507C-X2 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 Holosun HS507C-X2 on an airsoft RIS rail?

The Holosun HS507C-X2 runs on a 20 mm RIS or RIS II airsoft rail through its RMR-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.