This Apex Optic Mount Screw Set is a dedicated replacement or spare fastener kit for securing a Trijicon RMR or other RMR-footprint optic to an FN MRD pistol equipped with an Apex optic mount. The set solves the common problem of stripped, lost, or mismatched screws during optic installation or maintenance—ensuring a consistent, repeatable torque spec and a zero-shift-free interface between the slide and the optic. Each screw is precision-machined to match the thread pitch and length required by the Apex mount, eliminating guesswork and the risk of over-threading into the slide.
Compatibility
- FN 509 series (all MRD variants with Apex mount installed)
- FN 509 Compact
- FN 509 Tactical
- FN 509 Midsize
- FN 545 (MRD models with Apex mount)
- FN 510 (MRD models with Apex mount)
- Requires Apex optic mount for FN MRD pistols (sold separately)
Key Features
- Thread pitch and length matched specifically to the Apex mount for FN MRD pistols
- Heat-treated alloy steel construction for corrosion resistance and repeated torque cycles
- Includes (2) screws—sufficient for a single optic installation
- Compatible with Trijicon RMR (Type 1, Type 2, RM06, RM07, RM09) and Holosun 407C/507C/508T (RMR footprint)
- Standard hex-head (3/32” or 2.5mm) for use with a torque driver
Install Difficulty: 1/5
Tools required: 3/32” hex driver or 2.5mm ball-end hex key, torque wrench (recommended 15-18 in-lbs), blue Loctite 242. No fitting, filing, or modifications required. Simply remove existing screws, apply thread locker, and torque to spec. Estimated time: 5 minutes.
FAQ
Will these screws work with a factory FN slide without the Apex mount?
No. These screws are specifically designed for use with the Apex optic mount for FN MRD pistols. Using them with a factory mounting plate may result in incorrect thread engagement or insufficient thread depth.
Can I reuse these screws if I swap optics?
Yes, provided the screws are not stripped or deformed. Inspect threads visually before reuse. Always apply fresh Loctite and torque to 15-18 in-lbs. We recommend replacing screws after 3-4 removal cycles to maintain consistent torque.
What is the thread pitch and length of these screws?
These screws are M3 x 0.5 pitch, 6mm length. They are identical to the original screws included with the Apex mount kit. Verify your existing mount uses the same spec before ordering.
Shipping: Ships same business day if ordered by 2 PM EST. Flat rate $4.99 USPS Priority, free over $75. Warranty: This component is covered by a limited lifetime warranty against manufacturing defects. If a screw strips during normal installation, contact us for a replacement set.
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