Description
The Apex Optic Mount allows you to securely attach a red dot sight with an RMR footprint directly to your FN MRD pistol. Designed specifically for the FN Low Profile Optics Mounting System™, this mount fits slides that have the factory MRD optic cut, including models like the FN 509 MRD, FN 509 Compact MRD, and FN 510 MRD. It mounts directly to the factory slide without needing any additional MRD Key Insert, keeping the installation simple and the optic low to the slide for a natural sight picture.
This mount is a practical upgrade for shooters who want the reliability of a direct-mounted optic without the hassle of adapter plates. The included screws feature a High-Temperature Thread Locking patch pre-applied, so you can skip the liquid thread locker and avoid the mess or potential for over-application. This pre-applied patch ensures the screws stay secure under recoil, even during extended range sessions or training classes.
For California gun owners, this mount is a straightforward way to add an RMR-footprint optic to your FN MRD pistol while keeping the firearm compliant. It does not alter the magazine capacity, trigger mechanism, or any other feature that could affect compliance with California state law. The mount is engineered to maintain the factory slide’s reliability and does not require permanent modifications to the firearm.
Key features and specs:
- Compatible with FN USA slides featuring the MRD optic mount cut (FN 509 MRD, FN 509 Compact MRD, FN 510 MRD)
- Designed for the FN Low Profile Optics Mounting System™
- Accepts optics with an RMR footprint (including Trijicon RMR, Holosun 507C/508T, and similar)
- Direct mount to factory slide – no MRD Key Insert required
- Screws with pre-applied High-Temperature Thread Locking patch – no liquid thread locker needed
- Low-profile design keeps the optic close to the bore axis
- Durable construction for consistent zero retention
Fitment notes: This mount is intended for FN MRD pistols only. It will not fit standard FN 509 models without the MRD cut. Always verify your slide has the MRD footprint before installation. The mount is machined to tight tolerances for a secure fit, and the included screws are specific to this setup. Using aftermarket screws may compromise thread engagement or the locking patch benefit.
Priced at $70, this mount is a cost-effective solution for adding an RMR-footprint optic to your FN MRD pistol. It supports the reliability you expect from a direct-mounted system and works with the California-compliant FN models available through Calguns
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