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

Description

This screw set is built specifically for FN MRD pistols using an Apex optic mount designed for Trijicon RMR footprint optics. If you run an RMR, Holosun 407C/507C, or any other optic sharing that mounting pattern on your FN, this kit is the correct hardware to secure it. We stock these for Tucson shooters because standard screws often fail under the extreme dry heat, dust, and recoil cycles common in the desert.

Each screw is precision-machined from hardened steel with a black oxide finish. This resists corrosion from sweat, cleaning solvents, and the fine silica dust that gets everywhere out here. The threads are rolled, not cut, which improves tensile strength and reduces the chance of stripping when you torque them down on an Apex mount. These screws drop in without modification—no filing, no fitting.

• Heat-stable thread lock: Pre-applied patch holds screws in place under sustained firing and 115°F+ range sessions. No need to add liquid thread locker unless you prefer extra insurance.
• Suppressor-ready length: Designed to work with tall suppressor-height sights and the added mass of a can. No interference with your co-witness or mount interface.
• Exact fit for Apex mounts: Matches the thread pitch, head diameter, and shank length required by Apex optic mounts on FN MRD slides (FN 509, FN 545, FN 510, and similar models).
• Torque spec compatibility: Rated to handle the 15-18 in-lbs recommendation for RMR footprint optics. Overtorquing is the #1 cause of stripped screw heads in the desert—these hold up.

We sell these individually because optic screws get lost, stripped, or damaged from heavy use. At $20, you get four screws (two for the optic, two spares) plus the peace of mind that your optic won’t loosen mid-string. This is a common failure point on FN pistols run hard with suppressors—the extra back pressure and heat cycles can walk standard screws out. This set addresses that directly.

If you shoot suppressed in Arizona summer conditions, expect your optic screws to see more thermal expansion and carbon fouling than in a controlled indoor range. These screws maintain consistent torque retention across that temperature swing. The black oxide finish also reduces reflection during low-light shooting, which matters if you run a weapon light on your FN.

Compatible with: FN 509 series (all generations), FN 545, FN 510, and any FN MRD pistol using an Apex RMR footprint mount. Not for use with factory FN mounting plates or non-Apex aftermarket mounts. If you have a