Description
This screw set is built specifically for attaching a Holosun optic to an FN MRD pistol using an Apex mount designed for RMR footprint optics. If you shoot in Arizona’s high-dust, extreme heat, or run a suppressor, standard screws can loosen, strip, or fail under those conditions. This kit eliminates that hassle with hardened steel construction and precision threading that holds zero shot after shot.
Each screw is machined to exact OEM specs for a snug, wobble-free fit between the Apex mount and your Holosun optic. The black oxide finish resists corrosion from sweat, humidity, and cleaning solvents — a real advantage when you’re running long range sessions in the desert or packing your pistol in a dusty truck console. No more chasing loose hardware or worrying about thread deformation after a hot day of training.
Key benefits for your build:
- Dust and debris resistance: The tight thread tolerances reduce the chance of grit binding or cross-threading when installing in dirty field conditions.
- Heat stability: Steel construction handles the thermal expansion from direct sun exposure or a hot suppressor without losing grip on the mount.
- Suppressor-friendly retention: Extra thread engagement keeps the optic secure when firing suppressed, where increased backpressure and vibration can shake loose cheap screws.
- Drop-in installation: No filing, fitting, or thread-locker required — just torque to spec and you’re ready for the range or carry.
Specs and fitment:
- Compatible with Holosun optics using the RMR footprint (includes 407C, 507C, 508T, 509T, and similar models)
- Works with Apex Tactical mount for FN MRD pistols (FN 509 series, FN 545, and other MRD-cut slides)
- Screw thread pitch: M3 x 0.5 (standard for RMR footprint optics)
- Screw length: 6mm (optimized for Apex mount thickness)
- Material: Heat-treated 12.9-grade alloy steel
- Finish: Black oxide, corrosion-resistant
- Quantity: 4 screws (2 for optic-to-mount, 2 spares)
- Weight: 2 grams total
These screws are a direct replacement for the factory hardware that comes with your Apex mount. They provide a tighter fit than generic screws and are tested to hold zero through thousands of rounds in harsh environments. Whether you’re shooting steel in 110°F heat or running a can on your FN, this set keeps your optic where you
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