7 Best FNX 45 Tactical Red Dot Sights [Updated 2024]

What red dots fit FNX 45 tactical?

Here are 7 best FNX 45 tactical red dot sight. We have tested a handful of sights based on their durability, compatibility, reticle, battery life and cost.

The large MOA dot sight works exceptionally well for users with astigmatism, helping them acquire the dot faster based on my thorough experimentation and hands-on experience.

Let's check them out:

Best Red Dot For FNX 45 Tactical

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Holosun HE507C X2 - Best Overall

Bigger Buttons - Enlarged adjustment buttons for better reach Upgraded from the previous model. 

Very Long Battery life - The Shake Awake technology and solar panel significantly extend the battery life to over 50,000 hours. A motion sensor turns the reticle on and off to save battery power, and the Solar fail-safe power activates instantly when the battery runs out, ensuring that the optic stays on at all times.

No Hassle Battery Swap - You can access the CR1632 battery from the side tray, eliminating the need to remove the sight for a battery swap and re-zeroing. In my honest opinion, this design is much better than the Trijicon RMR.

At this price point, users can save a ton of money while getting a duty grade red dot sight for your FNX 45 Tactical.

Read HS507C X2 Review

Trijicon RMR Type 2 (6.5 MOA) - Best Overall

The Trijicon RMR red dot sight sets the gold standard for micro pistol reflex sights and is the top choice for handguns, rifles, and shotguns. When it comes to the FNX 45 Tactical, the RMR RM07 with the 6.5 MOA is the best RMR sight available.

Improved Accuracy - Super clean and fine 6.5 MOA red dot works for shooters with astigmatism with super clear dot clarity (Or try larger sizes)

Multi Color Options - Color matching your FNX 45 Tactical RMR with either Black or FDE color.

Built For Handgun Slide Cycling - The RMR Type 2 is specifically built to withstand handgun slide G force. The new battery compartment design grips the battery tighter to prevent loose electrical contact

Slide Racking Assist - Racking the slide one handed effortlessly by pressing the optic window frame against hard surfaces when necessary. This gives the shooter large surface area to charge the slide 

Trijicon SRO (5 MOA) - Largest FOV

Use FN RMR plate or CHPWS for direct mount

Why we picked the Trijicon SRO - The Trijicon SRO shares the RMR mounting footprint and enables quick target acquisition, making it easy to place the red dot in the center of the lens. I find this feature extremely helpful, especially when my eyes are slightly off-center from the optic. The window is just big enough for me to quickly reacquire the dot without any trouble.

In addition, the FNX 45 Tactical 's 1911 style grip angle enables the shooter to acquire the Trijicon SRO sight picture right away without being too low or too high. You can also experiment with different size grip backstraps to slightly change the grip angle that's best for you.

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

Field Durable - The 7075 T6 forged aluminum housing makes the sight super rugged construction to survive drop, however, not near the lens like the RMR

Ambient Light Brightness - The user can use the auto brightness mode on a sunny day or lock the brightness settings

Better Follow Up Dot Acquisition - Increased sight acquisition speed including consistent fast follow-up shots without losing the dot inside the window.

See Trijicon SRO review

Trijicon RMR HD - New 3rd Gen RMR

The brand new 2023 Trijicon RMR HD offers a larger window close to the Trijicon SRO, the mounting footprint is still the same as RMR, and the optic features a forward light sensor that automatically adjust the reticle brightness based on the target's lighting information.

Under significant light condition change either with pistol light use or bright sunlight, the reticle will be at the perfect dot brightness for target shooting and real world duty use.

Holosun 509T - Best Weatherproof

The Holosun 509T X2 red dot sight features a fully enclosed body design to keep debris from entering the optic. This is a fully weatherproof optic for the FNX 45 Tactical in any weather conditions. The fully multi coated lens is nice, but there is slight window edge distortion.

Titanium Durability – The optic can handle heavy recoil impulses and slide racking against hard surfaces. 

32 MOA Reticle + 2 MOA red dot - Same reticle system as HS507C, But without the 32 MOA Only mode

Battery Lasts A Long Time – 4+ years of long battery life + Solar Failsafe to keep the sighting system operational

Clamp Mount - Tighter and much more secure mount (CHPWS adapter plate)

Motion Activated Reticle –  Shake Awake technology just like Holosun 507C

Leupold DeltaPoint Pro - Additional Lens Durability

Use a spare M&P Core DPP mount plate)

See torque specs and how to install it here

Buy Leupold Part #171203

The DeltaPoint Pro offers a field of view size similar to the Trijicon SRO and is considerably more budget-friendly. However, it's ranked lower because it necessitates proper fitting or the use of an aftermarket optic to function effectively.

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

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

Read DeltaPoint Pro Review here

Swampfox Justice - Tapered Field of View

It's worth noting the Swampfox Justice red dot sight due to its tapered field of view that slightly enlarges the window size, along with its compatibility with the Trijicon RMR footprint.

The optic's body is constructed from 7075 T6 aluminum housing and offers a top load battery access, similar to the Trijicon SRO.

Overall, this optic provides an affordable option to start with for your FNX 45 Tactical.

FAQ

FNX 45 Tactical Red Dot Compatibility

The FNX 45 Tactical comes with sight mounting kit with plates and screws for the following sights:

Any RMR footprint sights and Docter Sight.

Which Optic Plate Fits The Leupold DeltaPoint Pro? 

The Leupold DeltaPoint Pro can be mounted with Leupold Part #171203

The optic can be mounted directly to the slide without a plate, but requires some material trimming to fit the optic (NOT recommended)

Pick Optic Color: FDE or Black?

For aesthetic, it's all based on your preference.