Optics ready plates for Sig P320 models with removable rear sight

Many Sig Sauer P320 optics-ready pistols – such as selected M17/M18, Legion, RX/RXP and R2-style models – use a cover plate that combines the optic cover and the rear sight. Once you remove this plate to mount a red dot, you lose your rear sight as well.

This category gathers optics ready plates for Sig P320 models that remove the rear sight with the cover plate. These plates are designed either to integrate a new rear sight or to add a rear dovetail, so you can run a red dot and still keep a usable backup sight picture.

Is your P320 one of the “removable rear sight” models?

Before choosing a plate, it helps to understand how your specific P320 slide is configured:

• Rear sight integrated in the cover plate (this category): On these P320 slides, the rear sight is part of the optics-ready cover plate. When you remove the plate, the rear sight disappears. For these models, you will typically want an adapter that:
  • Includes an integrated rear sight machined into the plate, or
  • Adds a new rear dovetail for mounting compatible rear sights.

  All plates in this category are optimized for this configuration – keeping your iron sight option while mounting your preferred red dot.

• Rear sight behind the optics cut (Pro Cut & similar): Other P320 optics-ready slides keep the rear sight in its own dovetail behind the optic cut. When you remove the cover plate, the rear sight stays in place. For these models you usually want a low-profile plate without an extra rear sight built in. For those, please see:
  • Optics Ready plates for Sig P320 with Pro Cut
  • Optics Ready plates for Sig P320 with Pro Cut and RMR holes

  These plates are tailored to slides where the rear sight remains in a separate dovetail and does not leave with the cover.

• Older P320 optics cuts (pre-2018): Some early Sig P320 optics-ready models (for example older P320-XFIVE) use a different slide cut geometry that you can recognize by a more straight, squared-off end of the optic pocket. Matching plates for those pistols are listed here: Optics ready plates for Sig P320-XFIVE.

Plates available for major red dot footprints

Adapter plates in this category cover a wide range of popular red dot mounting patterns, including (model-dependent):

• Trijicon RMR / SRO
• Leupold DeltaPoint Pro / Romeo1Pro-type cuts
• Shield RMSc
• Holosun K-Series
• Noblex / Vortex Venom
• Aimpoint Acro
• C-More RTS

Always check the individual product description for the exact combination of slide type + optic footprint it supports (for example: P320 RX/RXP, X-Five Legion, XCarry, XFull R2, M17/M18, etc.).

Precision fit for removable-rear-sight P320 slides

Each plate in this collection is CNC-machined specifically for Sig P320 optics-ready slides that lose the rear sight with the cover plate. You’ll find:

• Low-profile adapter 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, restoring a traditional sight picture on slides that would otherwise be “dot-only”.
• Competition-focused plates that maximize window exposure and speed of target acquisition.

This lets you tune your setup for carry, duty, or competition while maintaining a secure mount and reliable zero retention on this specific P320 slide style.

Iron sights & backup sighting options

If you want a traditional 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. For slides that lose the rear sight with the cover plate, look for plates here that reintroduce a rear notch or allow mounting a rear sight directly onto the adapter.

Have a non-OR Sig P320?

If your Sig P320 is not optics-ready from the factory, you can still mount a red dot using dovetail or dedicated mounting solutions. Explore our red dot mounts for non-OR Sig P320 pistols here.

Need plates for other Sig models?

Looking for optics plates for different Sig pistols? Browse our full range of optic adapter plates for Sig Sauer models.

Not sure which plate fits?

If you’re unsure which slide cut you have or which plate matches your optic, just contact us. Share your exact P320 model name (and ideally a photo of the slide cut), and we’ll help you pick the right adapter plate for your setup.