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The SIG Romeo1Pro footprint
Page last updated . Data compiled September 2026 by Andrew Terrebonne.
P320 X-Series factory optic cut
- Layout
- 2 screws, forward lugs — SIG's own pattern
- Screws
- M4 × 0.7
- Driver
- T10
- Torque
- 28–30 in-lb
- Pattern
- proprietary
Screws and torque from SIG Sauer, ROMEO1PRO operator's manual (REV05) ↗; the driver size is not in it. Checked against it September 30, 2026.
What to knowThe cut on most optic-ready P320 slides. Everything else mounts through a plate, so C&H, SIG and others make a lot of them.
What uses the SIG Romeo1Pro footprint?
1 optic uses it, 12 pistols are cut for it and 4 plates provide it. Screws M4 × 0.7; torque 28–30 in-lb. The lists below name each optic, pistol and plate.
Optics using this footprint
Pistols that mount it with no adapter
- SIG Sauer P320 X-Carry
- SIG Sauer P320 XCompact
- SIG Sauer P320 XFive Legion
- SIG Sauer P320 XTen
- SIG Sauer P320 AXG Legion / AXG Pro
- SIG Sauer P320 Spectre Comp
- SIG Sauer P320-M17 / M18
- Shadow Systems MR920
- Shadow Systems DR920 / DR920P
- Shadow Systems XR920 / XR920P
- Shadow Systems Foundation Series
- Shadow Systems MR920 Elite / Combat
Plates that provide this footprint
| Slide interface | Plate | Source |
|---|---|---|
| GLOCK MOS — standard & full size | V4 MIL/LEO (one SKU per footprint) | C&H Precision |
| S&W M&P C.O.R.E. / Optics Ready | C.O.R.E. Plate 6 (DPP family) M&P 2.0 → SIG Romeo1Pro | S&W factory ↗ C&H Precision ↗ |
| SIG Romeo1 cut (P226 / P229 RX Legion) | Romeo1 → Romeo1Pro | C&H Precision ↗ |
Check a pairing
The fit checker tells you whether a specific optic and pistol go together, and what it costs to mount.
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