The Apex Optic Mount is a direct-fit solution for mounting an Aimpoint ACRO P-1/P-2, Steiner MPS, or Lead & Steel Pandora PB-3 to your Sig Sauer P320. It’s built for the specific R2 slide cut found on the P320 Legion, M17, M18, and other factory-cut slides. At $65, it gives you a solid, no-fuss mounting platform without the premium markup.
This mount comes in two versions: with or without an integrated rear sight. The version with the integrated rear sight places that sight in front of the optic. That placement does double duty—it gives you a backup aiming reference, and it acts as a gas shield. That shield keeps carbon and debris off your optic lens longer, meaning less wiping and more shooting between cleanings on the range or in the dirt.
For co-witness, the integrated rear sight is set to sit in the bottom 25% of the optic window. You will need a tall front sight to complete the co-witness. We offer two different sight height packages—pick the one that matches your barrel length. The sights are regulated for point-of-aim equals point-of-impact at 15 yards with 124-grain NATO ammunition (this applies only to mounts with the integrated rear sight).
Key specs and fitment details:
- Compatible slides: Sig Sauer P320 with factory R2 slide cut (including Legion, M17, M18, and standard R2-cut models)
- Optic compatibility: Aimpoint ACRO P-1, ACRO P-2, Steiner MPS, Lead & Steel Pandora PB-3
- Works with factory Loaded Chamber Indicator (LCI)—no modification needed
- Material: Precision-machined steel or aluminum (check current SKU for specific material)
- Installation: Direct replacement for the factory optic cover plate; uses standard mounting screws (torque specs included with mount)
- Sight options: Choose mount with integrated rear sight, or mount without rear sight for a clean optic-only setup
If you’re running an ACRO or MPS on a P320 with an R2 cut, this mount gets the job done. No shims, no adapters, no guesswork. Pick your sight option, bolt it on, and get back to shooting.
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