Description
The Apex Optic Mount provides a solid, direct-fit mounting solution for Aimpoint ACRO P-1/P-2, Steiner MPS, and Lead & Steel Pandora PB-3 optics on your Sig Sauer P320. Designed specifically for the factory R2 slide cut found on the P320 Legion, M17, and M18 models, this mount eliminates the need for adapter plates and keeps the optic low to the bore axis for consistent accuracy.
Integrated Rear Sight Option – Choose the version with a built-in rear sight for a complete sighting system. The rear sight sits in front of the optic window and doubles as a gas shield, helping to keep your lens cleaner during use. This setup provides a lower 1/4 co-witness through the optic, letting you use your iron sights in the bottom 25% of the window. A tall front sight is required for this co-witness; two sight height options are available based on your barrel length.
Practical Fitment – The mount is machined to match the R2 slide cut profile and securely holds your optic without shifting or loosening under recoil. It is fully compatible with the factory Loaded Chamber Indicator (LCI) on P320 models, so you retain that visual function. For mounts with the integrated rear sight, the iron sights are regulated for point-of-aim equal to point-of-impact at 15 yards using 124 grain NATO ammunition.
What You Get – A direct replacement for the factory optic cover plate, machined from aircraft-grade aluminum with a black finish. The mounting hardware is included. Price is $65.
Compatible Optics:
- Aimpoint ACRO P-1
- Aimpoint ACRO P-2
- Steiner MPS
- Lead & Steel Pandora PB-3
Fits These Sig Sauer Models (with R2 slide cut):
- P320 Legion (full size, carry, compact)
- P320 M17
- P320 M18
- Other P320 models that have the factory -R2 optic cut
Specs:
- Material: 7075-T6 aluminum
- Finish: Hardcoat anodized black
- Mounting: Direct to R2 slide cut (no adapter)
- Rear sight: Optional integrated (front of optic) – provides lower 1/4 co-witness
- Front sight: Required (tall) – two height options based on barrel length
- Weight:
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