Description
This Apex Optic Mount solves the specific challenge of attaching a Holosun 509T to your FN 509, FN 545, or any FN pistol equipped with their Low Profile Optics Mounting System. Designed and built in Arizona, this mount handles the dust, heat, and suppressor use that come with desert shooting.
Built for the Desert
Machined from a solid billet of steel and finished with black oxide, this mount resists corrosion and holds up under direct sun, blowing sand, and high round counts. Steel construction means it won’t flex or shift when your pistol gets hot from suppressed fire or rapid strings. The black oxide finish reduces glare and stands up to holster wear.
No More Stacking Plates
The Apex mount includes an integrated locking key that fits directly into your FN slide. You do not need the factory MRD Insert plate. This eliminates the extra height and potential failure point of stacked plates. The Holosun 509T sits lower on the slide, which keeps your optic closer to the bore axis and helps with consistent cheek weld.
Secure, Direct Fitment
This mount is specifically made for the FN Low Profile Optics Mounting System. It bolts directly to the slide without adapters or shims. The integrated locking key engages the slide’s cutout, preventing the mount from shifting under recoil or when banged against cover. Once torqued, it stays put.
Fitment Details
Works with all FN 509 models (full-size, compact, tactical) and the FN 545 that use the FN Low Profile Optics Mounting System. Accepts the Holosun 509T (both standard and X2 versions). Installation requires standard tools — no special jigs or plates needed. Overall height from slide deck to optic base is minimized for co-witness with standard-height suppressor sights.
What You Get
– Steel mount body with black oxide finish
– Integrated locking key for direct slide engagement
– All necessary mounting screws
– No MRD Insert required
Real-World Performance
In high-dust conditions, the single-piece design leaves no gaps for grit to collect between stacked plates. Under heat from the Arizona sun or a hot suppressor, steel maintains its zero better than aluminum. The direct mount keeps your optic secure through hard use without adding unnecessary bulk to your slide.
Price: $60
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