How to mount a C-More STS-2 on a Weaver base: it is a C-More RTS open-emitter reflex, so it needs a Weaver-compatible C-More RTS mount, not a Picatinny one.
Updated 05 September 2026.
Fit a C-More STS-2 on a Weaver base
The C-More STS-2 is a C-More RTS optic. Here is the Weaver-compatible mount it needs and why a Picatinny footprint mount may not seat on a Weaver slot.
The C-More STS-2 is a C-More RTS optic, so it needs a C-More RTS 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 C-More RTS mount you can find is Picatinny-cut, the cleaner fix is to replace the Weaver base with a Picatinny rail, then use the standard C-More RTS Picatinny mount. Check the mount clamps square before locking it down.
- ›C-More STS-2 on a Picatinny railthe Picatinny case
- ›C-More STS-2 footprint and mountthe optic
- ›Weaver railthe base
- ›Picatinny mount on a Weaver railwhy the lug matters
Questions and answers
Fit a C-More STS-2 on a Weaver base?
The C-More STS-2 reaches a Weaver base through a Weaver-compatible Docter/Noblex-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.