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

About this product

The Break Point Armory Apex Optic Mount Screw Set for FN MRD Pistols is a specialized hardware kit engineered to interface an Apex Tactical MRD mounting plate with Holosun optics on FN 509/545 series pistols. This precision-machined screw set resolves thread engagement and height clearance issues endemic to factory-provided fasteners. Its sole function is to provide the correct mechanical interface between three distinct components: your FN pistol slide, the Apex MRD mounting plate for RMR-footprint optics, and a Holosun red dot sight.

What is the Apex Optic Mount Screw Set used for?

This screw set is used to physically secure a Holosun red dot sight to an FN 509 or 545 series pistol via an Apex Tactical MRD mounting plate. The kit provides four specific screws with precise thread pitch, length, and head dimensions to bridge the gap between the optic, the plate, and the slide's mounting holes. Factory screws supplied with either the optic or the mount often fail to achieve proper torque or protrude into the slide, potentially compromising the pistol's striker mechanism. This set eliminates that guesswork, delivering a direct, reliable mechanical connection.

How does the Apex Optic Mount Screw Set compare to using the Holosun factory screws?

The Break Point Armory kit is superior for safety and reliability when using an Apex MRD plate. The included Holosun factory M3-0.5x6mm screws are designed for direct slide mounting, not for use with an intermediary plate; they are typically 2.5mm too long for this application. Using the factory screws risks over-penetration into the striker channel, which can cause catastrophic malfunctions. Our kit's screws are precisely machined to a length of 7.5mm, ensuring full thread engagement in the slide without intrusion. For a direct-mount application without an Apex plate, the Holosun screws are the correct component; for the Apex plate system, our kit is mandatory.

What does it weigh and what are the dimensions?

The complete screw kit weighs 8.2 grams (0.29 oz), with individual screws measuring 7.5mm in length, 3.0mm in thread diameter (M3-0.5 thread pitch), and featuring a cone-point tip and 2.5mm hex drive head. The included T8 Torx key measures 45mm in overall length. The primary consideration is not the kit's weight but the dimensional precision of the fasteners; the 7.5mm length is the critical variable, calculated to provide 6 full threads of engagement in the FN slide's 4.5mm deep holes when accounting for the plate's 3.0mm thickness.

Who is this NOT for?

This set is not for users mounting optics directly to an FN MRD slide cut without an Apex plate, nor is it compatible with optics from Trijicon, Leupold, or Shield that use different footprint dimensions. It is also unsuitable for non-MRD FN pistol models like the FNS series. If you are installing an optic on a different mounting platform, such as our Action Enhancement Kit for CZ P-10, you will require a different, platform-specific fastener solution.

What's in the box?

The kit contains four (4) black-oxide finished, alloy steel M3-0.5x7.5mm cone-point screws and one (1) T8 Torx key. No thread-locking compound, washers, or alternate screws are included, as the design intent is minimalism and specificity. The cone-point screw design provides superior concentric location in the mounting plate compared to flat-point alternatives, reducing the potential for lateral shift during tightening. The Torx key is provided as a properly sized drive tool to achieve the specified 15 in-lb torque without deforming the fastener head.

Is the Apex Optic Mount Screw Set worth it at $20?

At $20, the set is a justified cost-of-entry for a safe and functional optic installation. The alternative—improvised hardware—carries a high risk of damaging your optic, mounting plate, or pistol slide, with repair costs easily exceeding $200. This kit represents a definitive, single-purchase solution to a well-documented compatibility gap. For the professional or enthusiast who values first-round reliability and mechanical integrity over makeshift parts-bin solutions, the $20 investment is non-negotiable. Consider it mandatory ancillary hardware, akin to the precision required for our 1911 Ejector Pin Fixture.