7 Best Red Dot for FN 509 Tactical

As the gun industry continues to evolve, handguns have not been left behind. Today, there are plenty of optic-ready handguns available on the market, and in this article on the best red dot for FN 509 Tactical, we will walk you through the top-rated red dot sights for this optic-ready handgun and help you decide.

Adding a worthy red dot on the FN 509 Tactical can be a game changer in the shooting field. From boosting your speed of target acquisition to fine-tuning your accuracy, red dot sights go a long way to enhance your shooting experience. What’s more, they boost your shooting confidence, enhance your situational awareness, and simplify your aiming point for fast follow-up shots.

When making your selection, it is important to tailor your needs to match your shooting environment and individual preferences. This curated article unveils the very best red dot sights for FN 509 Tactical that are exceptional in terms of precision and performance. What’s more, these optics are easy to use and suited for a wide variety of shooting applications.

Best Red Dots for FN 509 Tactical

So, without further ado, let’s jump right in.

1) Leupold DeltaPoint Pro Reflex Sight – Best Overall

best red dot for FN 509 Tactical



The Leupold DeltaPoint Pro Reflex Sight is arguably the best red dot for FN 509 Tactical available out there. It is crafted with a plethora of modern features to hone your skills and enhance the performance of your handgun beyond close-quarter combat.

This optic provides a clear, unobstructed field of view and a bold aiming point. This leads to confident aiming even in high-pressure situations. Besides, the 2.5 MOA red dot reticle features multiple brightness settings for use in any lighting condition.

In terms of construction, the sight is built to perform at the highest level in the harshest conditions. It is shockproof and impact-resistant to stand up to abuse. Moreover, it is fully waterproof and operable in temperatures from as low as -40℉ all the up to 160℉.

Another impressive feature of this versatile sight is the easy-access battery compartment. You can easily remove and replace the battery without re-zeroing the sight. Over and above that, it boasts click adjustments for precision shooting and a motion-activated illumination that keeps it ready for use.


  • 5 MOA red dot
  • Motion sensor technology
  • Fully waterproof, shockproof, and fog-proof
  • Tool-less spring-actuated battery compartment
  • Diamond Coat optics coating
  • Unlimited eye relief
  • 8 brightness settings
  • Locking adjustment system
  • Aluminum housing
  • Shrouded in rugged spring steel


  • Compact and lightweight
  • Built to last
  • Easy to operate
  • Holds zero well
  • Great warranty


  • Poor battery life

2) Sig Sauer Romeo1 Pro Red Dot Sight – Best for Close-Quarter Combat

best red dot for FN 509 Tactical



The Sig Sauer Romeo1 Pro Red Dot Sight is perfect for close-quarter combats where it decreases reacquisition time and enhances shooting precision. It is built with multifunctionality in mind to help you get the most value for your money.

A defining feature of this red dot sight is its accuracy. It employs a crisp 3 MOA reticle for rapid target engagement. Besides that, it comes with a new point-source emitter that provides exceptional brightness with 10 daytime and 2 night vision illumination settings.

The build quality of this sight is a force to reckon with. It has an aircraft-grade CNC housing to ensure a lifetime of reliable use. Furthermore, it boasts a ruggedized protective steel shroud and molded glass aspheric lens that make it impact-resistant.

What’s more, this red dot sight has motion-activated illumination for conserving battery life. Besides, it is IPX-8-rated for complete protection from moisture and dust.


  • 3 MOA reticle
  • Aircraft-grade aluminum houses
  • Molded glass aspheric lens
  • TruHold lockless zeroing system
  • Motion-activated illumination
  • IPX-7 water resistance rating
  • Ruggedized protective steel shroud
  • 12 brightness settings
  • Unlimited eye relief
  • 1 MOA adjustment click value


  • Good battery life
  • Excellent craftsmanship
  • Reasonable price
  • Accurate


  • Difficult installation

3) Holosun HS507C-X2 Red Dot Sight – Best with Multi-Reticle System

Holosun HE507C-X2



Here is another compact red dot sight specifically designed for sub-compact pistols like the FN 509 Tactical. It has a 50,000-hour battery life on average use and uses solar power to keep it working when the battery fails.

A defining feature of this red dot sight is its reticle. It has a multi-reticle system featuring three reticle options: a 2 MOA aiming dot, a 32 MOA ring, and both. This enables accurate aiming across vast distances. What’s more, the illumination of the red dot is adjustable into 12 settings for visibility in all light levels.

Construction-wise, the red dot sight has a durable 7075-T6 aluminum housing that is impact-resistant and shockproof. The interior is fully protected from moisture and dust damage to ensure unimpeded field use.

What’s more, this optic comes with a lock mode to prevent unintended settings changes and 1 MOA adjustment per click impact correction. Over and above that, it has multiple layers of antireflective coatings to ensure brilliant and clear views through the large sight window.


  • True 1x magnification
  • Multi-reticle system
  • Shake Awake technology
  • Parallax-free optics
  • Lock mode to protect settings
  • Multi-coated optics
  • Unlimited eye relief
  • Solar Failsafe technology
  • 50 MOA windage and elevation adjustment range
  • 12 brightness settings
  • IP67-rated waterproof and dustproof


  • Compact and lightweight
  • Compatible with night vision gear
  • Long battery life
  • Speed and accuracy


  • Slight learning curve

4) Sightmark Ultra Shot M-Spec Reflex Sight – Best Compact

Sightmark Ultra Shot



Sightmark Ultra Shot M-Spec Reflex Sight marks our next pick of the best red dot for FN 509 Tactical. It promises repeatable accuracy and ultra-fast target acquisition in all scenarios.

This red dot sights beats the rest in terms of optical performance. It brings to the table a premium wide-angle lens that works in tandem with the advanced anti-reflection optic coatings for bright and clear views of targets. Besides that, the optical system is parallax-corrected for unmatched reliability.

The construction quality of this optic is also exemplary. It is shockproof and recoil-rated up to .50 BMG, and constructed of rugged magnesium to guarantee durability and longevity. It is also IP68 waterproof and dustproof for all-weather use.

The other noteworthy features included are an integrated sunshade that is responsible for reducing reflections and glare, motion-activated illumination with a 12-hour shutoff, and 16 brightness settings for visibility in all light conditions.


  • Slotted W/E adjustments
  • Parallax-corrected optical system
  • Advanced anti-reflection lens coatings
  • Advanced double lens design
  • Motion-activated illumination
  • 10 daytime and 6 night vision brightness settings
  • Integrated sunshade
  • InterlockTM adjustment system


  • Compact and lightweight
  • Great battery
  • Ease of use
  • Battery included


  • Mount not included

5) Vortex Venom Red Dot Sight – Best Budget

Vortex Venom



This Vortex Venom Red Dot Sight is built with the avid shooter in mind. It features a large, bright reticle with 10 adjustable brightness settings for crisp-clear targeting and confident aiming in any light condition.

Like any other Vortex optic, this red dot sight is built to last. It has an aluminum alloy chassis that makes it ready for anything nature throws at it. Further, it is fully waterproof, submersible to 1m, and usable in temperatures ranging from 22 to 122℉.

When it comes to optical features, this red dot sight brings to the table premium wide-field lens for exceptional edge-to-edge sharpness and resolution. On top of that, it is fully multi-coated to boost light transmission in all lighting conditions.


  • Infinite eye relief
  • Aluminum alloy chassis
  • Parallax-free optical tube
  • Waterproof and submersible to 1m
  • Fully multi-coated optics
  • 10 brightness settings
  • 1 MOA impact point correction
  • Scratch-resistant Armortek exterior lens finish
  • 100 total adjustment range for windage and elevation


  • Compact size
  • Lightweight design
  • Clear picture
  • Multi-platform applications
  • Durable and well-made


  • Poor battery life

6) Trijicon RMR Type 2 Adjustable LED Reflex Sight – Best Build Quality

Trijicon RMR Type 2



When it comes to durability and versatility, it is hard to beat the Trijicon RM06 RMR Type 2 Adjustable LED Reflex Sight. It is ideal for a wide variety of shooting applications in virtually any environment.

This compact and user-friendly red dot sight combines extreme toughness and a compact body for functional use. Both the aluminum chassis and the glass window are impact-resistant to withstand the rigors of combat use. What’s more, the interior is fully waterproof and submersible to 66’.

The optical features of this red dot sight are also incredible. It has multi-coated optics to boost light transmission and optical clarity. Other than that, it is designed and built with unlimited eye relief and parallax-free optics for speedy and accurate aiming.

To top off everything else, this sighting tool features an automatic brightness control function for the 3.25 MOA red dot reticle whose illumination settings are adjustable into eight levels.


  • True-color multi-coated optics
  • Corrosion and scratch-resistant finish
  • Waterproof to 66ft
  • Eight brightness settings
  • 25 MOA red dot reticle
  • Parallax-free performance
  • 7075-T6 aluminum alloy construction
  • Unlimited eye relief
  • Battery conservation mode


  • Durable and well-made
  • Simple to operate
  • Accurate
  • Versatile and reliable
  • Crisp clear glass


  • A bit expensive

7) Swampfox Sentinel Micro Reflex Sight – Best for Beginners

Swampfox Sentinel



Lastly in our list of the best red dot for FN 509 Tactical is the Swampfox Sentinel Micro Reflex Sight. It is designed for use on micro handguns to decrease target reacquisition time and enhance overall shooting precision.

This red dot sight is compact but built to withstand the toughest conditions. It is constructed from 7075-T6 aircraft-quality aluminum that is tough enough to take in the beating. Furthermore, the sight is optimized for everyday carry use.

To complement the solid construction, this optic packs cutting-edge technology in the small frame, including a photosensitive sensor that adjusts the brightness of the reticle instantly to match the ambient light settings. Over and above that, it has a Shake N Wake technology system to conserve battery and keep it ready to shoot.


  • 3 MOA red dot reticle
  • Shake N Wake system
  • Photosensitive sensor
  • Unlimited eye relief
  • 10 brightness settings
  • Fully multi-coated optics
  • IPX-7 waterproof rating
  • Matte finish
  • 7075-T6 aluminum housing


  • Bright and crisp red dot reticle
  • Solid and reliable all-metal construction
  • Excellent fit and finish
  • Budget-friendly
  • Ease of installation


  • Lacks enough adjustment

Read Also

How to Choose the Best Red Dot for FN 509 Tactical

Buying a red dot sight for FN 509 Tactical is not something to do in a whip. Below are the important features you should take into consideration the following factors before you settle on any product.


While the FN 509 Tactical is an optic-ready handgun, it is not compatible with all the red dot sights available on the market. As you make your selection, take a look at the mounting system the red dot sight comes with and ensure that it is compatible with your specific handgun.

Build Quality

Like any other optic, the construction quality of red dot sights determines the overall durability and longevity. For the best red dot for FN 509 Tactical, we recommend a model that is built from high-quality materials preferably aerospace-quality aluminum.

Brightness Settings

A red dot sight is as good as the number of brightness settings it provides. With several brightness settings, you are guaranteed confident aiming and precision shooting in different light settings. A tip is to get a tool with more than eight adjustments for the reticle illumination.

Weatherproof Construction

Whether you plan to use the red dot sight for self-defense, target practice, or general range use, ensure that you pick a model that is fully waterproof, dustproof, and fog-proof. It is also wise to get a model that is ideally suited for use in a wide range of temperatures.

Battery Life

Most of the red dot sights for FN 509 Tactical are powered by batteries. A high-powered tool will last long and be economical to maintain.

Besides the battery life, look at the location of the battery compartment. It can be on top, underneath, or on the side. The best red dot sight for FN 509 Tactical comes with a top or side-loading battery compartment for easy access.


It is also important to look at the cost. Typically, the brand, nature of construction, and features incorporated determine the overall cost of a red dot sight. Look at the features the sight brings to the table and choose one that blends with both your budget and shooting needs.

How to Care for a Red Dot for FN 509 Tactical

When you take good care of the FN 509 Tactical red dot sight, you lengthen its lifespan while guaranteeing solid and reliable performance in the shooting fields. Here are some tips on how to take care of your red dot sight.

  1. Proper Cleaning. Clean the red dot sight with the right lens cleaner and a soft and clean microfiber cloth
  2. Battery Maintenance. Check the condition of the battery regularly and ensure that it is in good condition before using the red dot sight
  3. Remove Battery During Storage. Ensure that you remove the battery from the red dot sight if you intend to store the red dot sight for a prolonged period
  4. Avoid Impacts. Practice care and caution when using your red dot sight to prevent impacts and accidental falls that can break and damage the glass
  5. Regular Zeroing. If you use your handgun frequently, check the zeroing of the red dot sight and make the necessary adjustments to ensure consistent accuracy


  • Can you put an optic of the FN 509 Tactical?

Yes, you can put an optic on the FN 509 Tactical as it is an optic-ready handgun. The choice of optic should match your shooting habits and needs.

  • Can I use a red dot sight at night?

Absolutely. Red dot sights are designed and built to enhance your shooting precision in all lighting conditions, including typical nighttime settings. They have adjustable brightness settings for the reticle for users to tailor the visibility relative to the lighting conditions.

Final Thoughts

The key to revolutionizing the performance of your FN 509 Tactical is equipping it with the right accessories. All the red dot sights mentioned above offer the basic features you need to get the most out of your shooting. Determine your shooting habits and use this guide to get the red dot sight that caters to all your needs. Hopefully, you have found the article to be of great help.