What red dots fit the SIG Sauer P320 Full-Size / Carry (SIG-LOC PRO slide)?
Page last updated . Data compiled September 2026 by Andrew Terrebonne.
1 of the 77 optics tracked here mount to this slide, and 1 of those needs no adapter plate. This slide uses SIG-LOC PRO slide — P320.
No plate neededPlate neededDoesn’t fit
Mount systemSIG-LOC PRO slide — P320
Optics that fit1 of 77
No plate needed1
New to red dots? What footprint, plate, co-witness and the rest mean
Verify this onePublished fitment data for this slide is thin or
conflicting. SIG-LOC PRO slide assemblies for the P320 full-size and carry/compact. SIG's spec sheet calls this footprint SIG-LOC PRO, and nothing SIG publishes says it interchanges with SIG-LOC, so they're listed separately. Top-mount optics fit via removable recoil-lug pins; SIG doesn't publish which pattern. Confirm with the plate maker before ordering.
Cheapest ways to mount it
Cheapest overall, and with no plate$450–650SIG Sauer ROMEO-X SIG-LOC Prodirect — no adapterBuild sheet
On this modelSold by SIG as a SIG-LOC PRO slide assembly. It's not the P365 SIG-LOC footprint, or the Romeo1Pro cut on a standard optic-ready P320. The P320 family now has three different interfaces.
Every optic, and how it mounts
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.
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