For Holoson – Apex Optic Mount Screw Set for FN MRD Pistols with an Apex mount for RMR Footprint Optics

This screw set is built for Holosun optics mounted on FN MRD pistols using an Apex mount for RMR footprint optics. If you have an FN 509, FN 545, or FN 510 with an Apex mounting plate, these screws are the right fit. They replace worn, stripped, or missing hardware to keep your optic locked down tight.

Priced at $20, this is a straight-up replacement kit. No frills, no extra parts you don’t need. You get the exact screws required to attach your Holosun (or other RMR footprint optic) to the Apex mount on your FN pistol. That means no guessing, no digging through mixed hardware bins, and no wasted time.

Key benefits for bulk buyers and budget-minded shooters:

• Direct fit for FN MRD pistols with Apex mounts – Works with FN 509, FN 545, and FN 510 models that use the Apex mounting plate. Designed for RMR footprint optics, including Holosun 407C, 507C, 508T, and similar.
• No modifications needed – Drop-in replacement screws. Threads match the mount and optic interface. No filing, tapping, or fitting required.
• Cost-effective replacement – At $20, this is cheaper than buying a whole new mounting kit or paying for gunsmith labor to fix stripped screws. Buy a few sets and keep them in your range bag or shop stock.
• Solid steel construction – Hardened screws resist shearing and stretching under recoil. Holds zero after repeated firing sessions.
• Bulk-friendly packaging – Order multiple sets for your armory or shop. Consistent quality across every pack, so you can rely on them for builds or repairs.

Specs and fitment details:

• Compatible with: Holosun 407C, 407K (with adapter), 507C, 508T, 509T, and other RMR footprint optics.
• Mount type: Apex optic mount for FN MRD pistols.
• Pistol models: FN 509 series, FN 545, FN 510. Also fits other FN MRD handguns using the same Apex mount pattern.
• Screw type: Threaded to match standard RMR mounting holes. Includes both front and rear screws as required by the Apex plate design.
• Material: Heat-treated alloy steel. Black oxide finish resists corrosion.
• Quantity: Set includes all screws needed for one optic-to-mount installation.