Description
If you’re running a Sig Sauer P320 with an RX PRO cut slide, the Apex Optic Mount is the straightforward solution for mounting a Holosun 509T. This mount is machined from solid billet steel and features a black oxide finish — a combination that holds up well against Florida’s humidity, salt air, and daily carry sweat. No rust worries, just a secure foundation for your optic.
This mount is designed specifically for the Sig Sauer P320 platform with the factory RX PRO slide cut. It also fits M17, M18, and Legion slides without modification. If your P320 has the factory Loaded Chamber Indicator (LCI), this mount works with it — no need to swap parts or lose that feature. The mount positions the Holosun 509T low and tight to the slide, keeping your co-witness with factory iron sights intact and your draw stroke consistent.
Black oxide isn’t just for looks. It provides a corrosion-resistant surface that stands up to the coastal environment, and the steel construction means the mount won’t flex or shift under recoil. You get a solid, repeatable zero every time you reinstall the optic — important if you swap between carry and competition setups.
Key specs and fitment:
- Designed for Sig Sauer P320 slides with the factory RX PRO cut
- Compatible with M17, M18, and Legion slides
- Works with factory Loaded Chamber Indicator (LCI)
- Accepts Holosun 509T optic (both standard and X2 versions)
- Machined from billet steel for strength and stability
- Black oxide finish for corrosion resistance in humid/salt environments
- Low-profile design maintains co-witness with standard-height iron sights
- Includes necessary mounting hardware
This mount is a practical choice for anyone who carries a P320 with an RX PRO cut and wants to run a Holosun 509T. No adapters, no shims, no guesswork — just a direct fit that holds up to daily use in a coastal climate. At $65, it’s a solid investment in reliability for your EDC setup.
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