What red dots fit the SIG Sauer P226 / P229 Legion RX?
Page last updated . Data compiled September 2026 by Andrew Terrebonne.
19 of the 77 optics tracked here mount to this slide. This slide uses SIG Romeo1 cut (P226 / P229 RX Legion).
No plate neededPlate neededDoesn’t fit
Mount systemSIG Romeo1 cut (P226 / P229 RX Legion)
Optics that fit19 of 77
No plate needed0
Plate to buy19
Plate to slideper plate instructions
New to red dots? What footprint, plate, co-witness and the rest mean
Cheapest ways to mount it
How this slide mounts an opticThe older Romeo1 pocket. Upgrade plates convert it to Romeo1Pro or RMR-pattern optics.
Every optic, and how it mounts
Adapter plates for the SIG Sauer P226 / P229 Legion RX
| Plate | Gives you | Source | Price |
|---|---|---|---|
| Romeo1 → RMR / Holosun | Trijicon RMR | C&H Precision | $25–60 |
| Romeo1 → Romeo1Pro | SIG Romeo1Pro | C&H Precision ↗ | $25–60 |
GuidesSuppressor-height sights: will your irons co-witness? · Installing a red dot: what the makers say
Check a specific pairing
Open the fit checker with this pistol selected, or click any "how it mounts" cell above for that pairing's verdict and build sheet.
Deciding between a few? Compare 3 popular optics on this slide side by side: window, weight, emitter, cost to mount and co-witness.
Something on this page wrong?
Tell us what it should be, and include a source: nothing changes without one.