The SIG-LOC footprint

Page last updated September 30, 2026. Data compiled September 2026 by Andrew Terrebonne.

ROMEO-X SIG-LOC line; M17/M18 and P365 SIG-LOC slides

Layout: Five contact points; optic sits directly on the slide
Screws: Screws from beneath the slide
Driver: T8 Torx
Torque: 18 in-lb
Pattern: proprietary

Schematic, not to scale: top-down, front of the optic up.

Screws and torque from SIG Sauer, ROMEO-X SIG-LOC Compact operator's manual (REV01) ↗. Checked against it September 30, 2026.

What to knowSIG's bottom-mounted pattern, loading the screws in tension. SIG now sells SIG-LOC slides across the P365 line as well as the M17/M18, plus a separate SIG-LOC PRO pattern for the P320. SIG lists the ROMEO-X SIG-LOC Compact for P365 slides only, so treat SIG-LOC optics as host-specific until SIG says otherwise.

What uses the SIG-LOC footprint?

2 optics use it and 2 pistols are cut for it. Torque 18 in-lb. The lists below name each optic, pistol and plate.

Optics using this footprint

Pistols that mount it with no adapter

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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