6 Best Red Dot For FN 509

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Hey Shooters! Welcome to My Best Red Dot For FN 509 Tactical Blog in 2023.

I’ve been shooting with FN 509 Tactical for years and it’s one of my favorites.

I’ve checked out a lot of red dot sights for this gun and I’m excited to share what I’ve learned with you.

what optics fit on fn 509 tactical?

The best Optic for Fn 509 tactical is the Trijicon RMR. other than that I have found 5 other red dots that will fit 509 tactical perfectly.

Best Optic For FN 509 TacticalCategoryPrice
Trijicon RMR Type 2Best overall$499.99
Trijicon SROBest compact sight$526.89
Leupold Deltapoint ProMost durable$549.95
Holosun 507C GR X2Best low-light performance$309.99
Vortex VenomBest user friendly$249.00
Vortex ViperBest affordable sight$219.99

Top 6 Best FN 509 Red Dot Sights

  1. Trijicon RMR Type 2 – Best overall
  2. Trijicon SRO – Best compact sight
  3. Leupold Deltapoint Pro – Most durable
  4. Holosun 507C GR X2 – Best low-light performance
  5. Vortex Venom – Best user friendly
  6. Viper Viper – Best affordable sight

1. Trijicon RMR Type 2 – Best overall

Trijicon RM06-C-700672 RMR Type 2 Adjustable LED Sight, 3.25 MOA Red Dot Reticle, Black
  • 3.25 MOA ADJUSTABLE LED RMR: Features an automatic...
  • UNIQUE PATENTED HOUSING SHAPE: Military-grade aluminum...
  • BATTERY CONSERVATION MODE: Automatically adjusts aiming...
  • BUTTON LOCKOUT: Sets RMR into automatic mode to prevent...

An ultra-durable red dot sight tailored for the FN 509 Tactical, offering unbeatable clarity and versatility.

Adjustable LED Intensity: This feature is honestly a game-changer. We’re talking about a sight that lets you adapt to your environment in real time.

Whether under the blazing sun or it’s dusk, the adjustable LED intensity ensures you’re never caught off guard. The dot stays crisp, clear, and easy to see, no matter the setting. This is particularly useful in tactical situations where lighting can change rapidly.

Wide Field of View: Let’s talk about how crucial a wide field of view is. It’s like having peripheral vision that’s as good as your focused vision. 

You can pick up targets faster and track them more easily. This means you’re not just shooting; you’re shooting smart, utilizing your environment to the fullest. You don’t have to squint or adjust; your targets are visible and ready to be aimed at.

Durable Construction: You could say this sight is like a tank: robust and ready for anything. The construction quality here is top-notch, making it more than capable of handling the harshest conditions. 

This sight takes it all in stride, whether it’s rain, dirt, or the inevitable bumps and knocks. For those who don’t have the luxury to pause for gear adjustments in the field, durability is key.

Auto-Brightness Adjustment: Ah, the auto-brightness feature! This is yet another nod to the sight’s adaptability. Instead of fiddling around with settings, the sight adjusts itself according to the lighting conditions. 

It’s as if the sight knows what you need even before you do. This makes for quicker target acquisition and a more streamlined shooting experience overall.

Variety of Reticle Options: The reticle options allow you to choose what suits your shooting style best. 

Whether you’re into small dots for precision or bigger ones for rapid target acquisition, the RMR Type 2 has got you covered.

Why I Love It: Beyond the exceptional features, what makes this sight stand out for me is its performance under pressure. 

It delivers exactly what it promises, without fail, every single time. It’s the kind of reliability you can’t put a price on.

My Experience

After fitting this sight onto my FN 509 Tactical, the difference was day and night. The sight complements the firearm so well that it feels like they were made for each other. 

The wide field of view and crisp reticle have made target acquisition a walk in the park. Tactical or not, this sight has proven its worth in every scenario.


  • Crystal-clear glass
  • Adjustable LED intensity
  • Auto-brightness feature
  • Durable construction
  • Long battery life
  • Variety of reticle options


  • Need to unmount to replace the battery

2. Trijicon SRO – Best compact sight

Trijicon SRO Sight Adjustable LED 2.5 MOA Red Dot, Black
  • LARGE, UNOBSTRUCTIVE FIELD OF VIEW: Parallax-free and...
  • CLEAR, CRISP DOT: Fine-tuned, illuminated reticle,...
  • RED DOT PISTOL READY: Designed to fit on many of the...
  • SAME FOOTPRINT AS RMR: Mounts easily using the same...

A state-of-the-art red dot sight designed for quick target acquisition, perfect for FN 509 Tactical.

Large Field of View: Here’s where the SRO really shines: the large field of view. With the wide window, this sight gives you an expansive look at your surroundings, making it much easier to lock onto a target. 

I found this feature to be especially valuable in dynamic shooting scenarios. The ability to see more without moving my eyes or adjusting the sight is a key factor in both rapid target acquisition and situational awareness.

Top-Loading Battery Design: Changing batteries is a breeze with the SRO, thanks to its top-loading design. No longer do you have to go through the hassle of unmounting the sight. 

The practical advantage? Keep your zero intact. I must say, this feature removes one of the most common inconveniences associated with red dot sights, and it’s one that really stands out.

Extended Battery Life: The SRO packs an impressive 3-year battery life using a single CR2032 battery. This ensures you’re not constantly worrying about battery replacement, and you can focus more on your shooting. 

A long-lasting battery is always a high-priority feature for anyone who’s serious about their optics, and this sight delivers handsomely in that department.

150 MOA Adjustment Range: For those keen on precision, the 150 MOA adjustment range is a real asset. It allows for finer adjustments, giving you the ability to get that perfect zero. 

I found the dials to be crisp and the adjustments to be very predictable, which is crucial in tactical or competitive shooting scenarios.

No Color Fading in Window: The multi-coated lens guarantees there’s no color distortion, providing a clear and bright field of view. 

Even under varying light conditions, the sight picture remains consistent, aiding in quicker and more accurate shots. It’s one of those features you may not even realize you need until you experience it.

Why I Love It: The top-loading battery and large field of view are huge for me, but it’s the overall reliability and compatibility with my FN 509 Tactical that seals the deal. This sight just delivers, period.

My Experience

From day one, the Trijicon SRO felt like an extension of my FN 509 Tactical. The target acquisition is quick, and the sight holds up remarkably well under different conditions. I’ve used 

it in several tactical scenarios, and every single time, it’s been a joy to operate.


  • Large field of view for quick target acquisition
  • The top-loading battery design maintains zero
  • 3-year battery life
  • 150 MOA adjustment range
  • No color fading or distortion in the window


  • High price point

See Comparison of Trijicon SRO & RMR

3. Leupold Deltapoint Pro – Most durable

Leupold DeltaPoint Pro Red Dot Sight, 2.5 MOA Dot - Matte Finish - Night Vision
  • Model #179585 - DeltaPoint Pro Red Dot Sight, 2.5 MOA...
  • The Twilight Max Light Management Systems offers a...
  • This scopes comes with an illuminated reticle, which...
  • Motion Sensor Technology (MST) extends battery life by...
  • Design, Machined and Assembled in the USA. 100%...

A high-performing red dot sight built for precision and exceptional low-light usability, ideal for the FN 509 Tactical.

Twilight Light Management System: The Twilight Light Management System is the standout feature of the DeltaPoint Pro. Designed for optimum performance in low-light conditions, this is something that has always caught my attention. 

The system regulates light transmission and reduces glare, ensuring a clear view even when it’s starting to get dark. For someone who often finds themselves shooting in diverse lighting conditions, this feature is a godsend. 

It provides a level of flexibility and reliability that’s hard to find in other red dot sights.

Wide Field of View: The DeltaPoint Pro offers an impressively large field of view. It’s almost like watching a widescreen movie where you can see more of what’s happening. This is a feature that can be crucial in both competitive and tactical scenarios. 

Motion Sensor Activation: Another detail I really appreciate is the motion sensor activation. The sight activates as soon as it senses motion, ensuring that it’s ready to use the moment you pick up your FN 509 Tactical. 

This cuts down on the time you would otherwise spend fumbling to turn the sight on, making it a seamless part of your shooting experience.

Top-Loading Battery Access: Similar to the Trijicon SRO, the DeltaPoint Pro also features top-loading battery access. 

This is a feature that streamlines the process of changing batteries and ensures you maintain your zero. It’s a simple yet effective solution to what can often be a tedious task.

Rugged Build: Let’s talk durability. The DeltaPoint Pro is built like a tank. It can handle the wear and tear of regular use without showing signs of distress. 

It’s robust, it’s reliable, and it’s made to last, exactly what you would expect from a brand like Leupold.

Why I Love It: Honestly, it’s the Twilight Light Management System that’s the game-changer for me. The low-light performance is unparalleled, and it enhances my shooting capabilities in those challenging lighting conditions.

My Experience

This sight has been with me through many competitions and field tests, and it’s never let me down. 

The Twilight system is exceptional and has been a key factor in my shooting accuracy, especially in low-light scenarios. While the sight is a bit on the pricier side, it’s a solid investment.


  • Twilight Light Management System for exceptional low-light performance
  • Wide field of view
  • Top-loading battery access
  • Motion sensor activation
  • Auto turn-off to save battery
  • Extremely durable build


  • Slightly bulkier compared to other micro red dots

4. Holosun 507C GR X2 – Best low-light performance

HOLOSUN HS507C-X2 Classic Multi Reticle Red Dot Sight, Black
  • INCLUDES: Holosun HS507C-X2 Red Dot Sight | Coin...
  • LONG BATTERY LIFE: Features include Holosun’s Super...
  • ADVANCED TECHNOLOGY: There are 12 different brightness...
  • SHAKE AWAKE: Holosun’s Shake Awake Technology shuts...
  • Holosun optics with Solar Failsafe feature automatic...

A budget-friendly red dot sight packed with features rivaling the Trijicon SRO.

Advanced Solar Failsafe Technology: One of the coolest features is the Advanced Solar Failsafe Technology. In a world where battery life is crucial, this sight ensures that you’ve got a backup plan. 

If you’re in the middle of an extended shooting session and your battery starts to fade, don’t sweat it! The solar panel on top of the sight is designed to power your device in the absence of a battery. 

Shake Awake Technology: Now let’s talk about Shake Awake Technology, a feature that’s so smart it almost feels like magic. Have you ever left your sight on and found a dead battery later? This technology solves that problem. 

When the sight detects no movement, it’ll go to sleep, conserving battery life. But the moment you pick up your FN 509 Tactical, it wakes up instantly. 

It’s a great feature for both tactical and competition scenarios, allowing you to focus more on your shooting and less on power management.

Multi-Reticle System: Another high point is the Multi-Reticle System, which offers more than just a single red dot. You can choose between a circle, a dot, or a combo of both, depending on what the situation calls for. 

In high-stress situations, a larger circle might be more useful for quicker target acquisition. On the other hand, the simple dot is perfect for precise aiming. 

The ability to switch between these reticle types is a nice touch that adds layers of flexibility to your shooting experience.

Side Battery Access: Changing batteries can be a real pain, right? But with Side Battery Access, this sight takes the hassle out of it. 

You don’t need to remove the sight to replace the battery; you just slide out the side tray and pop in a new one. That’s it! It saves time and keeps your sight zeroed in.

Multi-Coated Lens: We can’t overlook the Multi-Coated Lens. The lens comes coated with multiple layers that work to reduce glare, especially in bright conditions. 

The red dot appears crisp and clear, allowing for precise shooting whether you’re on the range or in the field. The added layer of multilayer coatings enhances visibility, which is a bonus for any shooter.

Why I Love It: It’s an affordable alternative to Trijicon SRO but doesn’t cut corners on quality or features.

My Experience

I had my doubts initially, but this sight exceeded my expectations. It’s got a long list of features that make shooting not only easier but also more enjoyable.


  • Advanced Solar Failsafe Technology
  • Shake Awake Technology
  • Multi-reticle system
  • 50,000 hours of battery life
  • Easy battery replacement with side tray


  • Auto brightness sometimes falters
  • The field of view is smaller compared to the SRO

5. Vortex Venom – Best user friendly

Vortex Optics Venom Red Dot Sight - 6 MOA Dot
  • The Venom Red Dot Sight 6 MOA promotes rapid...
  • High quality, fully multi-coated lens offers a clean,...
  • The Venom also has an auto-brightness mode that uses an...
  • 1 MOA windage and elevation adjustments are super sleek...
  • The Venom Red Dot will fit well on multiple...

Affordable yet feature-rich red dot sight perfect for beginners and casual shooters.

Fully Multi-Coated Lens: Let’s jump right into the lens. This baby has a fully multi-coated lens, which essentially means that it offers top-notch clarity. 

It enhances light transmission and reduces reflection. So, you get a vivid, bright sight picture no matter what the weather is like.

Top-Loading Battery Access: Okay, let’s talk about the battery. Nobody wants to dismantle their entire setup just to change the battery, right? 

Vortex Venom comes with a top-loading battery feature, which means that you can replace the battery without removing the sight from your FN 509 Tactical. The advantage? It saves you time and ensures that you don’t lose your zero settings. 

Build Quality: The Vortex Venom is built with a matte black anodized finish, and it’s made out of metal, not plastic. This isn’t just for show; metal builds tend to be more durable and robust, which is something you’ll appreciate when you’re out in the field. 

Sure, it’s not military-grade stuff, but for its price range, the build quality is surprisingly good.

Auto Brightness Settings: Adjusting the brightness manually can be a pain, especially if you’re in a setting where light conditions are constantly changing. But hey, the Vortex Venom’s got you covered. 

It has auto-brightness settings that adapt to the environment you’re in. Let’s say you’re transitioning from a dark indoor space to a sunny outdoor field. The sight adjusts itself, so you don’t have to fiddle around with settings.

Why I Love It: This sight brings a lot of value to the table. It’s like the Swiss Army knife of red dot sights – not too flashy but loaded with useful features.

My Experience

Man, oh man, this sight was a treat on my FN 509 Tactical. Quick target acquisition, solid build, and easy maintenance. The top-loading battery was a game-changer for me.


  • Affordable and feature-rich
  • Top-loading battery access
  • Auto-brightness settings
  • Solid build quality
  • Lifetime warranty


  • Not as rugged as more expensive models

Review of Vortex Venom

6. Viper Viper – Best affordable sight

Vortex Optics Viper Red Dot Sight - 6 MOA Dot
  • The Viper Red Dot Sight has a super low-profile making...
  • The Viper's low height allows it to co-witness with...
  • The fully multi-coated, ultra-clear lens offers a wide,...
  • Hard anodized finish- highly durable low-glare matte...
  • Waterproof and shockproof construction ensure your...

The Vortex Viper: a compact, versatile red dot sight for the precise shooter.

Compact and Lightweight Design: The Viper is built to be small but mighty. It weighs a mere 1.1 ounces with a minimal footprint. When you’re in the field, its compactness really shines through. 

The low-profile design also minimizes snagging, which can be crucial in high-pressure situations. The lightweight aspect keeps the firearm balanced, making it easier to aim accurately and efficiently.

Bright and Sharp Red Dot: The Viper comes with a 6 MOA red dot, perfect for rapid target acquisition. It’s particularly useful for close-quarter engagements where speed is of the essence. 

The red dot is bright enough to be visible in broad daylight yet not too overpowering in dim conditions. Moreover, the brightness settings can be manually adjusted, making it adaptable for different lighting situations.

Fully Multi-Coated Lens and Armortek Coating: Visual clarity is a must-have for any sight, and the Viper doesn’t disappoint. The multi-coated lenses offer a clear, undistorted field of view.

The Armortek coating adds another layer of resilience against elements like dirt, oil, and even minor scratches. You’ll find it stays clean even in less-than-ideal range conditions, making maintenance a breeze.

Durable Construction: What’s impressive about the Viper is its rugged build. With a hard-anodized finish, the sight is both shockproof and waterproof. 

In real-world testing, the sight held its own against various environmental conditions and proved to be highly durable. 

Why I Love It: The Viper’s mix of compact design, durability, and bright optics makes it a valuable asset for any shooter.

My Experience

The Viper proved to be a game-changer on my FN 509 Tactical. Its compact form factor, combined with its low mounting, contributed to an efficient, agile shooting experience.


  • Compact and lightweight
  • Low mounting profile
  • Bright and sharp 6 MOA red dot
  • A multi-coated lens with Armortek coating
  • Durable construction
  • Excellent lifetime warranty


  • Manual brightness adjustment (no auto-brightness)
  • Battery replacement requires unmounting

See Detailed comparison of Vortex Venom And Viper.

Final Verdict

Alright, we’ve journeyed through a spectrum of red dot sights, each with its own set of bells and whistles, all designed to pair with the FN 509 Tactical. 

After exhaustive field testing and comparing them all, it’s clear that the Trijicon RMR Type 2 emerges as the top dog in this lineup. 

Now, remember, the best sight for you ultimately boils down to your specific needs and preferences. But in terms of overall performance, durability, and adaptability, this one takes the win.


Will the Holosun 507K fit the FN 509 Tactical?

No, the Holosun 507K is not designed to fit the FN 509 Tactical without an adapter.

What is the best optic for the FN 509 Tactical?

The Trijicon RMR Type 2 stands out as the best optic for the FN 509 Tactical.

What red dot fits on FN 509?

The FN 509 Tactical is compatible with a range of red dot sights, including the Trijicon RMR Type 2 and Leupold Deltapoint Pro.

What is the difference between 507K and 507C red dot?

The main Difference is the 507C has a solar panel for additional battery life, whereas the 507K does not.

What is the difference between FN 509 Standard and Tactical?

The FN 509 Tactical adds a threaded, extended barrel and is milled for reflex optic adapter plates.

How accurate is the FN 509 Tactical?

The FN 509 Tactical is extremely accurate, limited only by the shooter’s skill.

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I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

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