Apex Optic Mount for FN MRD Pistols to mount RMR Footprint Optics

Description

The Apex Optic Mount provides a direct, secure mounting solution for RMR footprint optics on select FN MRD pistols. Designed specifically for use with the FN Low Profile Optics Mounting System™, this mount interfaces directly with the factory slide cut — no additional MRD Key Insert or adapter plate is required. This keeps the optic mounted lower to the slide, which can aid in maintaining a consistent sight picture and allows for co-witnessing with standard-height iron sights on many setups.

Each mount includes precision-machined screws with a factory-applied High-Temperature Thread Locking patch. This pre-applied patch eliminates the need for liquid thread lockers, simplifying installation and reducing the risk of over-application or mess. The mount is constructed from steel for durability and designed to maintain zero under regular use. For California buyers, this mount is a straightforward path to adding a red dot to an FN pistol without modifying the firearm’s internal components or magazine capacity — fully compliant with state regulations.

Compatible models include:

• FN 545 Tactical (MRD slide models)
• FN 510 Tactical (MRD slide models)
• FN 509 series with MRD optic cut (including 509 Compact, 509 Mid, 509 Tactical, and 509 Midsize)
• FN Reflex MRD models
• FN FNX-45 Tactical (MRD slide models)

RMR footprint optics that fit this mount:

• Trijicon RMR (all generations)
• Holosun 407C, 407V, 507C, 507V, 508T, 509T (with appropriate adapter plate for 509T)
• Holosun EPS and EPS Carry (with RMR adapter plate)
• Sig Sauer Romeo1 Pro (with RMR footprint adapter)
• Leupold DeltaPoint Pro (with RMR adapter plate)

Specifications:

• Material: Steel, black oxide finish
• Height: Approximately 0.20 inches (measured from slide surface to base of optic)
• Weight: 0.3 oz
• Mounting type: Direct to FN MRD slide cut — no plate needed
• Includes: Mount, pre-applied thread-locking screws, installation instructions
• Made in the USA

Why this matters for California owners: This mount is a drop-in part that does not alter the firearm’s magazine capacity, threaded barrel status, or overall configuration — all critical factors for maintaining compliance with California’