Here are the 4 best FN 5.7 red dot sights. These will go directly on the new FN Five Seven MRD using factory provided mounting plates.

Based on my in-depth research and hands-on experience, the a large dot reticle works extremely well for users with astigmatism, and to acquire the dot fast. My favorite is the Holosun ACSS vulcan, which allows me to reacquire the dot if lost in the window.

For medium range shooting the 5.7mm can definitely deliver a flat bullet trajectory, therefore a smaller dot as small as 1 or 2 MOA works well.

Best Red Dot For FN 5.7 [Currently Compatible]

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  • Fastest Dot Re-Acquisition
  • Best Lens Durability
  • Largest Field Of View
  • Best Lens Durability
  • Best Durability

Holosun 507C ACSS - Fastest Dot Re-Acquisition

fn 5.7 red dot

Why Use ACSS Vulcan Reticle - The ACSS Vulcan reticle helps the shooter re-center the reticle after each follow up shot. The 250 MOA outer ring re-centers the eye to realign the optic 

Easier Battery Access - Replace the battery right from the side tray without re-zeroing or sight removal

Uses RMR Footprint - Same footprint as the Trijicon RMR

Bigger Buttons - Enlarged adjustment buttons for better reach for shooters with big fingers 

Super Light Weight - No weight difference from the the original 507C X2. It's light for carry

Built Like A Tank - Charge the slide against the optic without any issue

Read Holosun 507C X2 Review


  • Faster dot recentering
  • Long battery
  • 250 MOA ring is optional (On/Off)
  • Proven durability like an RMR


  • Not many complains

Leupold DeltaPoint Pro - Best Lens Protection

fn 5.7 sights

The Leupold DeltaPoint Pro is a classic red dot to go with the FN FIVE SEVEN MRD. It has similar FOV size as the Trijicon SRO, and it features extra layers of hood protection to divert impact stress away from the glass when the gun is accidently drop on the optic. 

New 6 MOA Available - 6 MOA is much more crisp and rounder to see than a 3 MOA for shooters with astigmatism

Extra Housing Protection - The added lens hood protects the optic from receiving direct impact that increases durability and making it fail proof.

Top Battery Access - Load/Replace battery right from the top!

Read DeltaPoint Pro reviews


  • Big rectangular glass FOV
  • Durable lens hood
  • 6 MOA now available
  • Lightweight


  • Short battery life 
  • Adjustment button is in an awkward spot

Trijicon SRO - Largest Field Of View

fn 5.7 red dot

Why we picked this one - Trijicon SRO is exactly the same as the original RMR but with a bigger circular shape FOV for faster sight acquisition for the FN FIVE SEVEN MRD.

Better Follow Up - Increased sight acquisition speed without losing the dot inside the window.

Bigger Window  - Re-acquire the sight picture faster after each follow-up shot even if the sight picture is slightly off center. 

Easier Battery Access - Load/Replace battery right from the top! No sight removal or re-zero required

Read Trijicon SRO review here


  • Big FOV
  • Very slick looking
  • Great for competition use


  • Not duty grade lens construction

Trijicon RMR - Best Durability

fn 5.7 red dot

The Trijicon RMR is the predecessor of the SRO. This is the gold standard red dot sight for pistol use, and many users choose this one for duty carry and range use.

The ruggedized lens frame diverts impact stress away from the glass much better than the Trijicon SRO's thin circular glass frame, and thus it's a much better choice for duty carry.

Besides that, the RMR is an open emitter red dot sight with plenty of dot sizes to choose from. 6 MOA is our favorite for pistol use.


  • Very durable
  • Large dot models offered
  • Great for concealed carry


  • Bottom battery loading requires sight removal to replace the battery

If you didn't find what you were looking for, may be you want to shop for a different handgun, please check out our pistol red dot buyer's guide on our site.

Common FAQ

How To Mount A Red Dot on the Original FN 57

fn five seven red dot

So far, the best optic mounting solution for the original FN Five Seven.

Dorin Technologies DT-CAOS mount

This is a special slide with a mount that works for DPP, RMR, RMSc and RMS footprint optics.

In addition, tall iron sights can be added to co-witness with the red dot.