Here are 4 best red dots for FN 545 Tactical. I have purchased, mounted and zeroed all these products, and only keep the ones that work well on this guide. While there are tons of options from just $100 to $700, the 45 ACP firearm requires something more sturdy like the Trijicon RMR.

One of my favorite is the Holosun 507C ACSS. Please check out the rest below:

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Best Red Dot Sights for FN 545

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Top 3 Options

Best Overall

Holosun 507C

holosun 507C

2 + 32 MOA Ring Reticle

Side Loading Battery

RMR footprint

Best FOV

Trijicon SRO

trijicon sro

5 MOA Dot

Top Loading Battery

Largest Field Of View

Great For Competition

Leupold DeltaPoint Pro

leupold deltapoint pro

6 MOA Dot

Top Loading Battery

Lens Protection

Holosun 507C X2 - Best Overall

holosun 507c acss reticle slow motion

NEW ACSS Model - Watch the 250 MOA outer ring guides the eye back to the reticle center

The Holosun 507C is a top-of-the-line red dot sight that is just slightly cheaper than an RMR for the FN 545 Tactical handgun. It's built like a tank similar to an RMR, with a rugged aluminum housing that can take a beating, yet it's lightweight and easy to mount.

The red dot is crisp and clear, with adjustable brightness settings for any lighting situation.

Uses RMR Footprint - Install it with the same Trijicon RMR adaptor plate that comes with the FN 545 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 - No need to remove the sight for battery swap and re-zeroing.

Solar Power BackUp - Solar fail-safe power kicks in immediately when the battery dies, so the optic will always remain on and ready.

Holosun 507C X2 Review

Trijicon SRO - Largest FOV

fn509 trijicon sro pov in action

The Trijicon SRO is the clear choice for a large window optic when shooting the FN 545 tactical. The sight's design, color scheme, and overall aesthetics are visually appealing and complementary to the FN 545. However, this optic is not duty grade as the RMR.

Find The Dot Much Faster  - Acquire the dot fast and consistent even if you're slightly off center. 

No Sight Removal or Re-Zero Required - Load/Replace battery right from the top! 

Faster Follow Up - Reacquire sight faster after follow-up shots muzzle flip without losing the dot inside the window.

Full Trijicon SRO Review

Trijicon RMR - Best Durability

Fn 545 tactical rmr

Trijicon RMR RM07-C-700679

When it comes to red dot sights, the Trijicon RMR sets the standard. It's the pioneer of the modern red dot sight and its performance and durability have made it the measuring stick against which all other red dot sights are judged.

When it comes to duty use on your FN 545 pistol, look no further than the RMR. It's been battle-tested and proven to be the most reliable option on the market.

Improved G Performance - The RMR Type 2 model grips the battery tighter to prevent loose electrical contact to keep the dot on

Multi MOA Dot Size Options - Highly recommend 6.5 MOA model for users with astimgatism or aging eyes

Slide Racking Assist - Rack the optic on the slide against any hard surfaces or belt to clear malfunctions. 

Leupold DeltaPoint Pro - Large FOV Like SRO

fn 545 tactical leupold deltapoint pro

The DeltaPoint Pro is Leupold's premier open emitter red dot sight, offering a field of view that is on par with that of the Trijicon SRO. However, it features a rectangular sight window rather than a circular one.

One of the great things about the DeltaPoint Pro is that it comes with an adapter plate and spacer that allows it to fit the FN 545 right out of the box, making it a great alternative option for those who prefer a different FOV glass shape.

Large Field Of View - Similar FOV as the Trijicon SRO but in a rectangular shape. If you want a duty grade carry optic, this is it

6 MOA and 2.5 MOA - 6 MOA option is much easier to see and it's now available for shooters with astigmatism

Better Hood Protection - The lens hood completely separates point impact away the main glass to increase the optic's durability.  

Easier Battery Access - No sight removal or re-zero required. This user friendly design has been implemented into many other new optics today.

Full DeltaPoint Pro review here