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

If you’ve got an FN MRD pistol and you’re itching to mount an RMR-footprint optic without fighting a clunky adapter plate, the Apex Optic Mount for FN MRD Pistols to mount RMR Footprint Optics is your ticket. Machined specifically for the FN Low Profile Optics Mounting System™, this mount drops right onto your factory slide—no MRD Key Insert needed. I’ve run this on my FN 509 MRD at the range, and it locks up tight as a vault. Let’s break down why this $70 piece of kit deserves a spot in your safe.

Manufacturer	Apex Tactical Specialties
Model	Apex Optic Mount for FN MRD Pistols
Material	Steel, black nitride finish (per manufacturer specs)
Compatibility	FN MRD slides (FN 509 MRD, FN 509 Compact MRD, FN 545 MRD, etc.) with FN Low Profile Optics Mounting System™
Finish	Black Nitride
Weight	0.8 oz (per manufacturer specs)
Condition	New

Key Features

• Direct-Fit Mounting – WHY IT MATTERS: No adapter plates or MRD Key Inserts means you’re not stacking tolerances. Your RMR sits lower, co-witnesses better with factory irons, and you avoid the wobble that plagues multi-plate setups.
• Pre-Applied Thread-Locking Patch – WHY IT MATTERS: Screws come with a High-Temperature Thread Locking patch already on them. Skip the liquid thread locker—no mess, no waiting, and no risk of over-application creeping into the screw holes.
• RMR Footprint Compatibility – WHY IT MATTERS: Works with Trijicon RMR, Holosun 407C/507C/508T, Swampfox Justice, and other RMR-pattern optics. That covers 90% of the red dots you’ll find at a gun show or online.
• Low-Profile Design – WHY IT MATTERS: Keeps your optic close to the bore axis, reducing felt recoil torque on the mount screws and helping you get back on target faster during rapid fire.

Who It’s For

This mount is for the collector who wants to keep his FN factory slide intact but needs a reliable, no-nonsense way to attach an RMR. It’s also for the competition shooter who demands a rock-solid interface—no shifting zero after a few hundred rounds. If you’ve got an FN MRD pistol and you’re tired of hunting down discontinued OEM plates, this is your fix.

Pros & Cons

• Pro: Direct mount to factory slide—no extra parts to lose.
• Pro: Pre-applied thread locker saves time and mess.
• Con: Only fits FN MRD slides with the Low Profile Optics Mounting System™. Won’t work on older FN slides without the MRD cut. Double-check your slide before ordering.

Comparison: Apex vs. Competitors

Feature	Apex Tactical (FN MRD Mount)	Zev Technologies FN Optic Mount	Agency Arms FN Optic Plate
Price	$70	$85	$95
Material	Steel, black nitride	7075 aluminum, black anodized	Steel, DLC coated
Compatibility	FN MRD slides only	FN MRD slides + some Gen 5 Glock cuts	FN MRD slides + Agency Arms slides
Thread Locker	Pre-applied patch	None (user must apply)	None (user must apply)
Height Over Slide	0.110 inches	0.125 inches	0.120 inches

The Apex mount sits lower than both Zev and Agency options—0.110 inches vs. 0.125 and 0.120 respectively. That’s a measurable difference if you want your RMR to co-witness with stock height sights. Plus, the pre-applied thread locker is a feature neither competitor offers at this price point.

FAQ

Will this mount work with my FN 509 Tactical (non-MRD)?

No. This mount is specifically designed for FN slides with the Low Profile Optics Mounting System™, which is found on MRD models like the FN 509 MRD, FN 509 Compact MRD, and FN 545 MRD. The standard 509 Tactical uses a different mounting interface.

What optics are compatible with this mount?

Any optic with an RMR footprint: Trijicon RMR (all generations), Holosun 407C/507C/508T, Swampfox Justice, and others. It does not accept DeltaPoint Pro or Shield RMS footprints.

Do I need to buy extra screws or a plate?

No. The mount includes all necessary screws with pre-applied thread locker. You just need the optic itself and a Torx bit (T10 or T15, depending on optic).

Will this mount let me use my factory iron sights?

Yes, if you have suppressor-height or “co-witness” sights. The low-profile design allows standard-height sights to co-witness with most RMR optics, but check your specific sight height for absolute co-witness.

Is this mount legal for USPSA Carry Optics division?

Yes. The mount keeps the optic low and within the box dimensions. It does not add significant height, so it’s legal for USPSA Carry Optics and IDPA SSP/Custom divisions.

Why Buy From Us?

• ✅ Nationwide delivery (all 50 states)
• ✅ Ships 1-2 business days
• ✅ 30-day returns
• ✅ Secure checkout

See more: Optic Mounts | FN Parts | Apex Tactical

Last updated: April 2026