Best FN Reflex MRD Holosun Optics - Red & Green Dot Sights

The FN Reflex MRD (Mini Red Dot) looks like a CCW winner. It's got a smooth trigger, high magazine capacity, comes optics ready, and has that legendary FN quality.

In this fitment guide we are going to tell you which Holosun Red & Green dot sights fit directly on the slide and give you information you need to decide which you like best.

What Holosun red dots fit the FN Reflex MRD?

The optics we'll be recommending are the Holosun 407K, 507K, 507K ACSS Vulcan, and EPS Carry. Keep reading to learn more about each.

What footprint is the FN Reflex MRD?

The FN Reflex MRD uses a modified RMSc footprint which allows you to mount any Holosun K Series footprint optic or a standard RMSc footprint optic. Read our RMSc vs Modified RMSc guide to learn more.

Why do we recommend Holosun vs other brands?

• They are affordable but not cheap.
• They come in red & green reticles with different sizes and styles.
• They are built sturdily with strong aluminum or titanium housings and glass.
• They have convenient features like Shake Awake and Side Mounted Batteries.
• They have a Limited Lifetime Warranty.
• They are reliable.
• They are waterproof.
• They have a great track record.

When you compare them to other options like Crimson Trace, Viridian, Bushnell, Vortex or others you will find prices are similar but the Holosun has more features, better battery life, a better track record, and better reticles.

Best FN Reflex MRD Holosun Red & Green Dot Optics 

Below are the best Holosun red and green dot sights you can put on the FN Reflex MRD. These will fit directly on the slide with no modification necessary. 

1. Holosun 407K Green & Red Dot - Best Budget Option

Buy the 407K At The Best Price

This is the most affordable micro optic Holosun makes and is available in a 6 MOA green or red dot.

If you are looking for a single dot optic that is very affordable and great for plinking then this might be the one for you.

The 6 MOA dot is a really nice size. It's big enough to pick up rather easily, but still small enough to be precise with.

It has an aluminum housing, side removable battery, manual brightness controls, shake awake, is IP67 waterproof, and 50,000hrs of battery life.

Read our full 407K review here.

2. Holosun 507K Green & Red Dot - Best Overall Option

Buy the 507K At The Best Price

The next step up from the 407K is the 507K. This has all the same features like an aluminum housing, side removable battery, manual brightness controls, shake awake, IP67 waterproof, and long battery life but it also has Holosun's Multi Reticle System (MRS).

The MRS Reticle is a 32 MOA Ring with a 2 MOA dot. It's really cool when you look at it - it's similar to an EOtech's reticle if you've ever seen them.

The other cool thing is you can toggle the reticle holding down the "-" for 3 seconds. So if you wanted to, you could use just the 32 MOA Ring, the 2 MOA Dot only, or both the 32 MOA Ring + the 2 MOA Dot.

Read our full 507K review here.

3. Holosun 507K ACSS Vulcan Green & Red Dot - Best Specialty Option

Buy the 507K ACSS Vulcan At The Best Price

Next on the list is the 507K ACSS Vulcan. This is exactly like the 507K except is has the ACSS Vulcan reticle. This reticle has a 230 MOA dotted outer ring and a 3 MOA center dot.

The purpose of this reticle is to help you find the center dot quickly if you are off center. To learn more about the ACSS Vulcan reticle check out our article here.

The dotted outer ring can be turned off by holding down the "-" button for 3 seconds.

The main advantage of the ACSS Vulcan reticle is to be able to find the center dot quickly when drawing the pistol.

All the features are the same as the 507K except for the reticle, and this is available in both red & green.

Read our full 507K ACSS review here.

4. Holosun EPS Carry - Best Closed Emitter Option

Buy the EPS Carry At The Best Price Available in 2 MOA Dot, 6 MOA Dot, and MRS, Red Dot or Green Dot.

Features: MRS Reticle or 2 MOA Reticle or 6 MOA Reticle  Shake Awake 50,000 Hr Battery Life Removable Side Battery IPX8 Waterproof 8 Daylight Brightness Settings and 4 Night Vision Aluminum Housing Enclosed Emitter

The EPS Carry is very similar to the 407K and 507K except it has one major difference, it is an enclosed emitter optic. This means the laser emitter is protected by a hood. So dirt, mud, or debris will never get in the way of the emitter to distort the reticle. 

There are 3 versions of the EPS Carry. The 2MOA, 6MOA, and MRS Versions

The MRS version has a solar panel on it which acts as a solar fail safe to power the reticle of the battery dies. It also gives you an extra auto brightness feature which can be toggled on or off.

Read our full EPS Carry review here.

Choosing between Red or Green Reticles

You may be wondering if you should get a red or green dot reticle. We get this question a lot so I am going to list a few bullet points for you to consider.

• Green reticles are less straining for the eye to see.
• Green reticles can help with astigmatism. If you have astigmatism you will see a blurry dot, we have been told by a few customers that Green dots help with their astigmatism, making the dot look more crisp than the red version.
• Green will not washout on backdrops like green grass, foliage, or green colors.
• In theory Green dots can have a longer battery life because Green is brighter, so for example a green dot on brightness setting 6 may be the same brightness as a red dot on setting 7 - which would save battery life.

If you want to learn more check out our full article about Red vs Green Dot Pros & Cons here.

Choosing between Open vs Closed Emitters

The simplest way we can break down open vs closed emitters is to look at how you plan on carrying the pistol. If you plan on being outdoors in the elements with rain, snow, sleet, then a closed emitter will be beneficial.

If you plan on carrying OWB most of the time and plan on being outside then closed emitter would be beneficial.

If you plan on carrying IWB or don't plan on being outside using your red dot in the pouring rain or heavy snow then an open reflex is fine.

Open reflexes will still work in the rain or snow but the closed emitter will give you extra peace of mind.

An open reflex can collect dust and debris on the inside of the reticle over time, so you'll want to clean it out from time to time. An enclosed emitter is easier to clean in this aspect.

To learn more about Open vs Closed emitters you can check out our Open vs Closed Emitter Guide here.

How to decide which reticle style is best for you

In this guide we covered a few different reticle options. If you need some help deciding which is best for you here are some of our thoughts on each.

	2 MOA only : This dot is quite small which makes it precise. The downside is that it can be hard to “pick up” upon drawing the weapon. If you are experienced shooting red dot sights on pistols then this may not be an issue for you. If you are new, we recommend you practice “finding the dot” at home to become proficient. If you can train your muscle memory to find the dot then 2 MOA is a great choice.
	6 MOA only : This dot is decently larger than the 2 MOA dot. We classify this as more user friendly than the 2 MOA dot as it’s a bit easier to pick up upon drawing. The 6 MOA dot will not be as precise as the 2 MOA dot at long distances (50+ yards) but it is still plenty accurate at all distance ranges. The 6 MOA dot is a nice size and it gives you a less cluttered reticle. Some people prefer it over the MRS.
	MRS Reticle (32 MOA Ring + 2 MOA Dot): This reticle is a good combination of both large and small. You have the 2 MOA dot to be precise with, and the 32 MOA Ring to help “find the dot”. The 32 MOA Circle is quite hard to miss. The nice thing about this reticle is the flexibility. You can use the 32 MOA Ring only or the 2 MOA dot only or both together. This way you can find what you prefer and stick to it.
	ACSS Vulcan with 3 MOA Dot and 230 MOA Dotted Outer Ring : This reticle is going to have a 3 moa dot and the 230 MOA dotted outer ring. The outer ring is only visible when the dot is not centered. The purpose is to help you find the dot quicker upon drawing the weapon. The 3 MOA dot give you a slightly larger dot than the 2 MOA dot, but it’s not that noticeable. The real value to this reticle is the outer ring and it’s assistance with helping you get on target faster by quickly adjusting your grip to “find the dot”

Conclusion

As you can see there are quite a few options to choose from. We recommend choosing something you believe suits your needs and specific application best.

If you have any questions reach out to us on chat.

Thanks for reading!