Apex Optic Mount for Holosun 509T to Sig P320 RX PRO Cut

Description

The Apex Optic Mount provides a secure mounting solution for attaching the Holosun 509T to your Sig Sauer P320 slide equipped with the factory RX Pro cut. This mount is machined from a single billet of steel with a black oxide finish, built for demanding use in duty rigs, competition shooting, or serious pistol upgrades.

Designed specifically for the P320 RX Pro slide cut, this mount also fits M17, M18, and Legion slides. It works with models that include the factory Loaded Chamber Indicator, so you don’t lose that function. The mount is precision-engineered to lock the 509T in place without shifting under recoil, giving you consistent zero retention through thousands of rounds.

Key benefits for your setup:

• Solid steel construction — Billet steel with black oxide finish resists corrosion and withstands hard use, unlike aluminum mounts that can deform under heavy recoil or repeated slide drops.
• Direct fit for RX Pro cuts — No adapter plates needed for P320 slides with the factory RX Pro cut. Drop-in installation saves time and eliminates potential failure points from stacking plates.
• Holosun 509T compatibility — Specifically machined to match the 509T footprint, ensuring a tight interface without gaps or movement. Your optic stays locked in for competition draw-and-fire drills or duty holster reholstering.
• Retains loaded chamber indicator — Works with factory LCI slides, so you maintain visual confirmation of a round in the chamber without modifications.
• Low profile design — Keeps the optic close to the slide for a lower bore axis, improving recoil management and reducing snag risk on gear or clothing.

Specs and fitment:

• Material: Billet steel, black oxide finish
• Compatible optics: Holosun 509T (all generations)
• Compatible slides: Sig Sauer P320 with factory RX Pro cut (including M17, M18, Legion)
• Loaded chamber indicator: Compatible with factory LCI slides
• Price: $65

This mount is built for shooters who need reliable optic retention on a P320 duty rig or competition gun. The steel body handles the heat of high-round-count training without stripping or loosening. Whether you’re running a P320 in a holster for eight hours or burning through a match stage, the Apex mount keeps your 509T exactly where you set it.