In this guide, let's check out some of the best FN 509 red dot sights on the market.
After testing so many optics in the past few years, we feel confident to honestly recommend these based on durability, mount compatibility, ability to retain zero, long battery life and price. The ones that don't work well didn't make the list.
Let's check it below:
Best FN 509 Red Dot Sights
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Top 3 Best Red Dot For FN 509
Best Overall
Holosun 507C
Best FOV
Trijicon SRO
Best For Competition
DeltaPoint Pro
Trijicon SRO - Largest FOV
Why we picked this one - The Trijicon SRO is by far the best large window optic for the FN 509 tactical, FN 509 LS Edge, and other handguns for fast target acquisition.
Bigger Window - Acquire the red dot fast and consistently even if you're slightly off center. Spend no time looking for the red dot reticle or getting lost in the window during follow up shots.
Easier Battery Access - Load/Replace battery right from the top! No sight removal or re-zero required
Better Follow Up - Reacquire the red dot sight after follow-up gun shots muzzle flip without losing the red dot sight from inside the window.
Same RMR mounting footprint - Using the exact mounting footprint keeps everything compatible without having to buy special accessories.
Features:
- Magnification: 1X
- Reticle: 5 MOA option is the best
- Turret Value: 1 MOA / Click
- Field of View: Round 0.98" X 0.89"
- Construction: 7075 T6 aluminum
- Dimension: 2.2"X1.3"X1.4"
- Weight: 1.6 oz
- Battery Life: 3 - 4 years
Holosun 507C X2 - Best Overall
People love Holosun red dot optics for FN 509 - The Holosun 507C X2 does the same thing the original V2 model does but better in every way that improved the shooting experience while still remains affordable.
NEW ACSS Model - Watch the 250 MOA outer ring guides the eye back to the reticle center
Uses RMR Footprint - No special adapter or milling required! Just use the same Trijicon RMR adaptor plate that comes with the FN 509 Tactical.
Bigger Buttons - Adjustment buttons in the dark or day easily even with big fingers
Near Infinite Battery life - 50,000 hours of battery life plus solar panel backup power if the battery goes out.
Side Loading Battery - This feature eliminates the need to remove the sight for battery swap and re-zeroing. Access the battery from the side tray
Solar Power BackUp - Solar fail-safe power kicks in immediately when the battery dies, so the optic will always remain on and ready.
At this price point, which is the lowest it's ever been for a Trijicon RMR alike sight, You'll save a ton of money. Just make sure to click the button below for the best deal.
Features:
- Magnification: 1X
- Reticle: 1 MOA, 32 MOA ring, or combined
- Turret Value: 1 MOA / Click
- Field of View: 0.63" X 0.91"
- Construction: 7075 T6 aluminum IP67 rated
- Dimension: 1.78"X1.15"X1.15"
- Weight: 1.5 oz
- Battery Life: 3 - 4 years
Trijicon RMR - Best Durability
Trijicon RMR RM07-C-700679
Trijicon RMR is the grandfather of all modern red dot sights for pistols. This is one of the most durable red dot sights made ever for duty use on your FN 509 tactical pistol.
Tighter Battery Grip - The Type 2 model grips the CR2032 battery much tighter to prevent lose electrical contact during high G recoil
Combat Proven Durability - The forged 7075 T6 aluminum frame and body features rounded hood edges divert any point impact stress away from the glass to withstand physical abuse
Rounder Dot Appearance - 6.5 MOA red dot that gives that big center reticle without the red dot dots looking smeared when dealing with emitter glare
Slide Racking Assist - RMR is very rugged for slide racking against any hard surfaces.
Features:
- Magnification: 1X
- Objective Lens: 0.9" x 0.6"
- Eye Relief: Unlimited
- Reticle Type: 6.5 MOA dot
- Turret : 1 MOA / Click
- Length: 1.8 inches
- Weight: 1.2 oz
- Battery: CR2032
- Battery Life: 4 years
Leupold DeltaPoint Pro - Large FOV Like SRO
The DeltaPoint Pro is Leupold's best open emitter red dot sight. The field of view of this compact red dot sight is as much as a Trijicon SRO but in a rectangular shape. The FN 509 comes with an factory adapter plate and spacer to fit the DeltaPoint pro right out of the box.
Larger Window Than RMR - The field of view is so much bigger than Trijicon RMR, and the optic height is just right for most shooters
6 MOA and 2.5 MOA - 6 MOA option is much easier to see and it's a feature now available for shooters with astigmatism
Extra Lens Hood Protection - The added lens hood protects the optic from receiving direct impact that increases durability and making it fail proof.
Easier Battery Access - No sight removal or re-zero required. This user friendly design feature has been well tested and implemented into many other new optics today.
Features:
- Magnification: 1X
- Objective Lens: 1.01" x 0.68"
- Eye Relief: Unlimited
- Reticle Type: 2.5 or 6.5 MOA
- Turret : 1 MOA / Click
- Dimension: 1.8" X 1.3" X 1.3"
- Weight: 1.9 oz
- Battery: CR2032
- Battery Life: 1600 hours
Vortex Venom - Best Value
Why we pick this one - The Vortex Venom is an entry level red dot sight. It's not for duty use, but it's good for range use without spending over $300.
Top-Loading Battery Access - Install the battery right from the top without the worry of removing the whole sight or having to re-zero the sight afterward
Multiple Intensity Settings - Rapid target engagement under a full range of lighting conditions
Wide Field of View - Thin lens hood frame doesn't obscure the brightness of the dot in the shooter's field of view for better sight acquisition and does not lose the brightness and accuracy of the dot.
Super Lightweight - Weighing only 1.1 oz built with rugged aluminum housing, its compact design helps for high speed shooting
Features:
- Magnification: 1X
- Window Size: 0.58" x 0.77"
- Eye Relief: Unlimited
- Reticle Type: 3 or 6 MOA
- Turret : 1 MOA / Click
- Dimension: 1.6" X 0.98" X 0.95"
- Weight: 1.0 oz
- Battery: CR2032
- Battery Life: 3000 hours
Common FAQ
FN 509 Tactical Red Dot Compatibility
The FN Low Profile Optics Mounting System is compatible with almost all micro red dot sights on the market.
The included package contains mounting plates and screws for some of the most popular optics such as:
- Vortex Viper, Razor, Venom
- Docter Optic
- Trijicon RMR, SRO
- C-More STS2
- Burris
- Leupold DeltaPoint Pro
Highly recommend using the aftermarket CHPWS plates for tighter slide to plate contact surfaces.
As the content creator of badassoptic.com, My background in the firearms industry and shooting sports gives me the experience to recommend tried and true products and keep away subpar ones.
