Best Fn 509 Tactical Red Dot Sights

Hey shooters! I am back with another review of the best red dot sight for fn 509 tactical in 2023 that will help you make the best choice for shooting equipment.

This time around, I am lining up our best picks for red dots to be mounted onto your FN 509 tactical pistol. If you’re a proud owner of an FN 509 tactical, you must possess great taste in firearms and would always be on the quest to find the perfect optics to match the elegance and Accuracy of your pistol or rifle.

For me, the best fn 509 tactical red dot compatibility is the Trijicon SRO, But I have also reviewed other red dots for you to choose from.

Here are my top preferences for the best red dot sight for FN 509 Tactical that I tested and analyzed on the accounts of durability, battery life, size, and retention.

If you are in a hurry I have mentioned below my top picks and what they offer you

  • Trijicon SRO (Best Durable and Accurate)
  • Vortex Optics Venom (Best budget – Friendly RDS)
  • HOLOSUN HS507C X2 (Best for Battery Life)
  • Leupold DeltaPoint Pro (Best Value)
  • Vortex Optics Viper (Best Affordable Red dot sight)

Top 5 Best Red dot Sights For Fn 509 Tactical

Table showing the Best fn 509 tactical red dot sights with a quick comparison table listing all their key features.

Key Features
Trijicon SRO
Parallax free design
Aluminum housing
30000 hours battery life
Top loading battery compartment
Vortex Optics Venom
Aluminum housing
10 brightness levels
Automatic plus manual brightness mode
30000 hours battery life
Solar failsafe tech
Shake awake
Lock mode
50000 hours of battery life
Leupold DeltaPoint Pro
Top loading battery compartment
Aluminum housing
Great lowlight performance
Vortex Optics Viper
6 moa dot
Low profile
Multicoated lens
Water and dust protection

 1. Trijicon SRO – Most Durable and Accurate

Trijicon SRO
Trijicon SRO (Image credit: Amazon)

View On Amazon View On Optics Planet


Brand: Trijicon | Material: Aluminum | Dimensions (L*W*H): 2.2 x 1.3 x 1.4 in. / 55 x 32 x 34mm

What’s So Special?

  • Fast target acquisition
  • Accuracy and durability
  • 3 years of continuous use

The brand name Trijicon speaks for itself. Trijicon is known for its durability and Accuracy. This very approach has been used in making the Trijicon SRO sight. So, if you prefer a red dot with high Accuracy and fast target acquisition, this is the optic for you. Its parallax-free design makes it possible for you to retain the position of the reticle even if you move your head around. Also, it provides a larger field of view that makes its application in the army or combat firearms more viable because, in such situations, you need to acquire as many targets as you can on higher distances.

Another thing any firearm or equipment used in combat should possess is; durability. FN 509 tactical is a pistol, better known for its use in the military apart from the normal commercial use, so Trijicon SRO sight matches the set mark of withstanding abuse with its aluminum housing.

Its battery provides 3 years of continuous usage without having to change it, and even when you have to change the batteries, it’s convenient due to the top-loading system, and you don’t even end up losing zero.

Personal Experience

When I bought the Trijicon SRO sight, I was looking forward to receiving a product worth the price I paid for it, and I certainly didn’t regret this purchase. It made shooting more fun, and what I loved about it was how convenient it proved to be once I was shooting in bad weather and lighting conditions because it had automatic brightness settings and manual ones.


Trijicon SRO sight is The sight for you if you want something extraordinary that makes your shooting experience with FN 509 tactical handgun fun as well as worth it.

  • Best for combat shooting
  • Durable
  • Crisp dot for more Accuracy
  • wide field of view
  • Expensive
  • No mount

2. Vortex Optics Venom – Best Budget Friendly

Vortex Optics Venom
Vortex Optics Venom (Image credit: Amazon)

View On Amazon View On Optics Planet


Brand: Vortex | Material: Aluminum | Dimensions (L*W*H): 6.1 x 4.8 x 2.1 inches

Why Is This The 1st Runner Up?

  • Similar features like Trijicon SRO
  • Half the price of Trijicon SRO
  • 30000 hours of battery life

What if I tell you, you could get similar features as the ones in a Trijicon SRO sight in something less than half of its price. How does that sound? Great, doesn’t it?

So, yes, for a budget-friendly amount of approximately $349, you can get a Vortex Venom Red Dot Sight that has similar features to that of a Trijicon sight.

Like the Trijicon SRO, Venom also has impeccable durability – on the accounts of the aluminum housing, hence guarantees the safety of the sight. It also features ten brightness levels to choose from, for your reticle, in a manual mode and has automatic settings, making it easier to achieve the target in unfavorable lighting conditions. Another thing that makes it possible for the Venom to match the Accuracy of a Trijicon sight is its 3 Moa red dot that doesn’t flare close to the edges, giving precision.

Also, suppose you want to save yourself the fatigue and inconvenience of changing batteries. In that case, Venom comes to the rescue with 30000 hours of battery life and a top-loading system that makes battery switching easier since you can do it without removing your sight.

All this in a product that also suits your budget. I’d say it’s a grab!

Personal Experience

When I bought a Trijicon SRO, one of my friends wanted the same. Still, since Trijicon was way out of her budget, she ended up buying Vortex’s Venom after thorough research, and although she was skeptical about the features and quality because of the price, man, she hit the jackpot! It’s undoubtedly a great product. One thing we benefited from was its excellent field of view – when we shot at a close range and up to 100 yards without compromising on the results.


Vortex Venom red dot made it to the second place in our list, not for nothing. A sight as accurate, durable, and within your budget is a clever purchase!

  • Easy installment
  • Lightweight
  • Easy battery change
  • Budget-friendly
  • Same mounting footprint as Trijicon RMR type 2
  • Considered best only for hunting
  • It doesn’t support night vision

3. Holosun HS507C X2 – Excellent Battery Features

HOLOSUN HS507C X2 (Image credit: Amazon)

View On Amazon View On Optics Planet


Brand: Holosun | Material: Aluminum | Dimensions (L*W*H): 5 x 4 x 4 inches

What You’ll Love About It?

  • Exceptional battery life with 50000 hours of continuous run
  • Durable
  • Maximum light transmission

Now, who doesn’t love a product with exceptional battery life? When it comes to the sights, Holosun provides you with a gem with up to 50000 hours of battery life on the accounts of its new and advanced technology – A solar failsafe that saves the sight from being powered off when your battery runs out because it automatically adjusts the brightness of the reticle according to the surrounding’s lighting conditions. Also, the awake shake feature saves the battery from running out itself since it turns the LED off when you’re not using it and gets it back on upon sensing the slightest motion. If you’re a sucker for long hunting treks, this sight is the best red dot for FN 509.

Another thing that comes with discussing the durability of red dots is whether it’s waterproof. Nothing is entirely waterproof, but Holosun HS507C can resist the damage for 30 minutes throughout if you submerge it 1 meter under the water (IPX-7), making it efficiently waterproof if not a cent percent. Not bad at all!

You’d adore this product because its multilayer glass coating provides you with the best optical experience since it reduces the blazing of light and facilitates maximum transmission of light waves through it.

Personal Experience

My hand on experience with Holosun has always been great, without a doubt. Their red dot sight still makes it one of my favorite products from Holosun. Something that I found interesting and User friendly was the Lock mode that prevents unintended changes in settings. This feature makes using an optical device such as red dot sight itself more convenient and precise. Loved it!

Also, it looked good with my FN 509, matching the elegance. The design is quite appealing in hand, and it doesn’t look too tall or bulky.


A great red dot sight with brilliant battery features, too in your budget that doesn’t offer less, if anything – more than the red dot sights of its competitors; Holosun HS507C X2 Circle Dot Solar Failsafe will make your hunting experience more convenient than ever.

Check out my detailed Vortex Venom vs Holosun 507c comparison

  • Exceptional battery life
  • User-friendly features
  • Great for budget
  • Compact and elegant design
  • Doesn’t offer a protective storage cover in the package

4. Leupold DeltaPoint Pro – Best Value

Leupold Delta Point Pro
Leupold Delta Point Pro (Image credit: Amazon)

View On Amazon View On Optics Planet


Brand: Leupold | Material: Aluminum | Dimensions (L*W*H): 4 x 6 x 3.37 inches

What About It?

  • Convenience with precision
  • Easy brightness adjustment
  • Well-built

Leupold DeltaPoint Pro Reflex Sight is the best red dot for you if you prefer comfort and Convenience along with precision.

The best part about this product is its battery compartment located on the top for easy access. It serves a great purpose because you don’t have to remove your sight in order to change the batteries. This way, you get to retain the zero, which is a big concern when it comes to optical devices of a firearm.

Other than that, there is no compromise on the building since it has an aluminum housing machined in the USA. Neither do you have to worry about the precision or Accuracy of the dot as it features easy and efficient brightness settings for the reticle too?

You won’t regret this purchase!

  • Top loading battery compartment
  • User friendly
  • Night vision
  • Lightweight
  • A bit overpriced in comparison with its competitors offering the same features

5. Vortex Optics Viper – Best Affordable Red dot sight

Vortex Optics Viper
Vortex Optics Viper (Image credit: Amazon)

View On Amazon View On Optics Planet


Brand: Vortex | Material: Aluminum | Dimensions (L*W*H): 4.5 x 5.4 x 2.3 inches

Last but not the least

That brings us to the last among our 5 red dot sights chosen for FN 509 tactical, and here we have a sight from Vortex yet again.

It comes with the signature precision and Accuracy of Vortex sights. In addition, it’s actually really affordable, and the cost is worth the features.

Also, no one likes an added weight on their firearm. Especially a pistol-like FN 509, the optic mounted on it should be snag-free and lightweight to not degrade the look as well as remain easy on the hand. Such is the vortex viper red dot – low-profile.

Not just this, but it also has a lens with multilayer coatings that prevent it from dust, light, etc., and provide unhindered filed-of-view.

I’d say it’s not a bad choice at all!

  • Low profile
  • Affordable
  • Not so great battery features 

Things To Keep In Mind While Purchasing A Red Dot Sight

Money and time are the two resources that you’d never want to end up wasting over useless products, so save yourself the misery and keep these things in mind when you’re out in the market looking for the best red dot sight for FN 509 Tactical pistol.


A durable red dot sight that can bear pressure or attack is the one you need to mount with your Fn 509, which is considered best for combat. Go for the ones with aluminum housing and a rugged exterior. All 5 products mentioned above offer this feature. Still, Leupold DeltaPoint Pro Reflex Sight and Trijicon SRO Red Dot take the trophy.

Battery Features

Trust me. The most annoying thing would be if you just picked up your red dot sight and were ready to shoot when you realize you’re out of battery. Or if you have to take up the fatigue of removing the sight while changing the batteries and end up losing zero. That is why a red dot sight with the best battery features is really important. I’d suggest you choose HOLOSUN HS507C X2 Solar Failsafe when it comes to the battery features.

Buy Once Cry Once!

It would be best if you went for a sight that isn’t so heavy on your pocket while matching the requirements of the best suitable red dot sight for your fn 509. If you want to go for a more budget-friendly sight, then Vortex Venom Red Dot is the best pick for you, while if you are someone like me who likes to invest in an extraordinary product once and cherish the experience for years to come, based on durability and efficiency, then you must go after the no.1 pick in this list – Trijicon SRO fn 509 tactical red dot

Zero Retention

When the sight is removed and reattached to the pistol or rifle (to change the batteries or so), most red dot sights fail to hold their zero, so you need to choose the sight that has good zero- retention or doesn’t require removal or sight for the sake of battery changing, so you don’t have to compromise on the accuracy and precision in target acquisition – like Trijicon SRO Red Dot, Vortex Venom Red Dot, and Leupold DeltaPoint Pro micro Reflex Sight.

Low Profile

There is a great demand for low-profile red dot sights that are easily mounted and look good on the pistol without adding extra weight to the host firearm. Your FN 509 needs exactly this, so pick the compact red dot sight like both Vortex sights and Trijicon SRO sight.

Bottom Line

I hope this review was helpful, and by now, you’re able to compare the features and requirements of all the possible options of red dot sights for your FN 509 Tactical.

I’ve also reviewed top 5 best lights for 509 tactical.

For further inquiries, take a look at the FAQs below.

See you in the next review. Happy hunting!


What red dot comes on the FN 509 tactical?

FN 509 Tactical comes with a pre-mounted Vortex Venom Red Dot Sight ready for use.

Can you put a red dot on an FN 509?

Although it comes with a pre-mounted Vortex Venom Red Dot Sight, its compact design still allows it to be compatible with any red dot sight in the market you find suitable for it.

Is FN 509 optics Ready?

Yes, FN 509 is completely optics ready and would allow easy mounting for any optic of any brand.

Related Post