About the Apex Optic Mount Screw

For Holosun and other RMR footprint optics, this Apex Optic Mount Screw Set is specifically designed for use with an Apex mounting plate on FN MRD pistols.

Real benefits for your build:

• Precision fit for FN MRD pistols: These screws are machined to match the exact thread pitch and length required by Apex mounts on FN factory slide cuts. No guesswork, no stripping.
• Compatible with Holosun and RMR footprint optics: Works with popular red dots like the Holosun 407C/507C/508T, Trijicon RMR/SRO, and others that share the same mounting pattern. If your optic uses the RMR footprint, this set covers it.
• Grade 10.9 steel construction: Provides the tensile strength needed to withstand slide reciprocation without loosening or shearing. A must for defensive or range-use pistols in California.
• Includes all necessary screws: The set comes with the correct quantity and lengths for mounting the optic to the Apex plate, plus any needed for the plate-to-slide interface. No extra hardware to source.
• Straightforward installation: Use a standard hex key (sizes included in the kit) and apply the recommended torque value (typically 15-18 in-lbs, per Apex specs). No specialized tools required.

For California firearm owners, every component must work reliably—especially when you’re limited to 10-round magazines and roster-approved handguns. This screw set eliminates the weak point in your optic mounting system, keeping your red dot firmly attached shot after shot.

Specs and fitment notes: Designed for FN MRD pistols (including the FN 509 MRD, FN 509 Compact MRD, and FN 509 Tactical) when used with an Apex mounting plate. The screws are compatible with Apex’s specific plate geometry, so verify your plate model before ordering. Threads are standard for RMR footprint optics; if you’re using a Holosun with a different screw size (like the 507K or EPS series), this set is not intended for those. Always check your optic