About the Apex Optic Mount Screw

The Apex Optic Mount Screw Set is a dedicated hardware solution for FN MRD pistols using an Apex mount designed for RMR footprint optics. This set provides the correct replacement screws for securing your red dot sight to the mount, ensuring a reliable and consistent fit.

Real benefits for FN MRD pistol owners: If you are setting up a new optic, replacing lost or stripped screws, or simply want spares on hand, this screw set removes the guesswork. The screws are precision-machined to match the Apex mount’s specifications, reducing the risk of over-torquing or cross-threading. This helps maintain a secure optic attachment for range sessions, training, or defensive use.

Specs and fitment: This screw set is compatible with FN MRD pistols (including models like the FN 509 MRD, FN 509 Compact MRD, and FN 509 Tactical) that use an Apex mount for RMR footprint optics. The RMR footprint is standard for many popular red dots, including the Trijicon RMR. The screws are constructed from hardened steel to withstand repeated recoil and environmental exposure. Each set includes the necessary screws for mounting the optic to the Apex plate.

• Designed specifically for Apex mounts on FN MRD pistols
• Fits RMR footprint optics (Trijicon RMR, Holosun 507C/407C, and similar)
• Hardened steel construction for durability
• Replaces worn, stripped, or missing screws
• Simple installation with standard tools (torque wrench recommended)

Why this matters for your setup: A loose optic can cause zero shift or damage to the sight and mount. Using the correct screws from the manufacturer of the mount ensures proper engagement depth and thread interface. This set is a practical, low-cost addition to your maintenance kit or build project. It is also useful for gun owners who switch optics between pistols or want to keep a backup set in their range bag.

It is legal to purchase and install on any legally owned and registered FN MRD pistol in California.

Included in the set: Two (2) mounting screws for the optic-to-plate interface. Verify your specific Apex mount and optic model for compatibility before purchase. For best results