Optics ready plates for Sig P320 FULL-SIZE

The Sig Sauer P320 FULL-SIZE is a popular choice for duty, range and home-defense setups – and many of these pistols leave the factory optics-ready. This category is dedicated specifically to adapter plates for Sig P320 FULL-SIZE optics-ready models that use the DPP / Romeo1Pro-style cut, including Pro Cut slides and variants with extra RMR holes.

Whether your full-size slide is a classic RX/RXP-type, an XFULL configuration or a Pro Cut version, you’ll find plates here that match both your slide and your chosen red dot footprint.

How your P320 FULL-SIZE slide is cut

Most P320 FULL-SIZE optics-ready slides share the same base DPP cut, but there are a few important details to keep in mind:

• Standard DPP cut with rear sight behind the optic: Many full-size slides keep the rear sight in a separate dovetail behind the optic pocket. When you remove the cover plate, the rear sight stays in place and you can install a low-profile adapter plate for your chosen red dot.
• Pro Cut & Pro Cut with extra RMR holes: On some P320 FULL-SIZE Pro Cut slides you’ll see additional RMR screw holes drilled into the slide. All plates in this category still attach via the original DPP cut, so the same adapters work for both plain Pro Cut and “Pro Cut with RMR holes” slides. The extra RMR holes are mainly there for direct-mount setups – using a dedicated plate is usually the safer choice, as it spreads recoil across pins and plate borders instead of relying only on two optic screws.
• Rear sight integrated in the cover plate: Certain full-size optics-ready models combine the cover plate and rear sight into one part. When you remove it, you lose the rear sight. For these slides, look for adapter plates with an integrated rear notch or designs that add a new rear sight position so you can keep a backup sight picture with your red dot.

If you’re unsure which of these layouts your P320 FULL-SIZE has, a quick look at the top of the slide (or a photo sent to us) is usually enough to identify the correct plate.

Plates for the most popular red dot footprints

Within this P320 FULL-SIZE category you’ll find plates for many of the common pistol red dot footprints (model-dependent), including:

• Trijicon RMR / SRO
• Leupold DeltaPoint Pro / Romeo1Pro-type optics
• Shield RMSc
• Holosun K-Series
• Noblex / Vortex Venom-type footprints
• Aimpoint ACRO
• C-More RTS and similar competition optics

Always check the individual product description for the exact slide type + optic footprint combination it supports (for example: P320 FULL-SIZE RX, P320 XFULL, full-size Legion variants, etc.).

Precision fit for P320 FULL-SIZE optics-ready models

Each adapter plate in this collection is CNC-machined specifically around the P320 FULL-SIZE optics-ready slide families. You’ll find options such as:

• Low-profile plates that keep the optic as close to the slide as possible for a lower bore axis feel.
• Plates with integrated rear sights or rear-dovetail solutions for slides that lose the rear sight when the cover plate is removed.
• Competition-focused plates that maximize window exposure and speed up target acquisition for sport shooting.

This lets you tune your full-size P320 for carry, duty or competition while keeping a secure mount and reliable zero retention.

Iron sights & backup options

If you want a classic sight picture or a backup to your red dot, we also offer iron sights for Sig P320 optics-ready models, including suppressor-height sets for co-witness, fiber optic fronts and tritium night sights. On slides that lose the rear sight with the cover plate, look for plates in this category that reintroduce a rear notch or provide a mounting point for a new rear sight.

Have a non-OR Sig P320 FULL-SIZE?

If your P320 FULL-SIZE is not optics-ready from the factory, you can still use a red dot by installing a dovetail or dedicated mounting solution. For those setups, check our red dot mounts for non-OR Sig P320 pistols.

Need plates for other Sig models?

Looking for optics plates for a different Sig pistol (compact P320 variants, X-Series only models, or P365 family)? Browse our full range of optic adapter plates for Sig Sauer models.

Not sure which plate fits?

If you’re not fully sure which P320 FULL-SIZE slide you have or which plate matches your optic, just contact us. Share your exact model name and, ideally, a photo of the slide cut and top of the slide. We’ll help you pick the right adapter plate for your setup.