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Top 6 Holosun Optics for the Sig P365x, xl, X-Macro, and P365-380

Top 5 Sig P365 Holosun Optics

If you have a Sig Sauer P365x, P365xl, P365 X-Macro, P365-380, or Sig P365 9mm CA Edition then you know it has an “Optics Ready” slide. This means the slide is milled out so you can bolt on a red dot sight.

What you might not know is exactly which red dot sights fit it. This can be confusing, but we are here to make it simple.

The P365x, P365xl, and P365 X-Macro, P365-380 all have the same optics footprint. The footprint is essentially the bolt pattern. Different red dots have different bolt patterns or footprints. The footprint on these Sig models is the RMSc footprint.

Therefore you will need a red dot that has an RMSc footprint.

The Holosun Red Dots we recommend for the Sig P365x, P365xl, P365 X-Macro, or P365-380 are:

The Holosun optic line is a great value here’s why… 

  • They are affordable but not cheap. 
  • They are built sturdily with strong aluminum housings and glass. 
  • They have convenient features like Shake Awake and Side Mounted Batteries.
  • They have a Limited Lifetime Warranty.
  • They are reliable.

Holosun has two popular lines of red dot pistol sights. The “C” line and the “K” line. The “K” series is slightly smaller for more concealed carry and doesn’t have a solar panel. This is what fits on the Sig P365x, P365xl, P365 X-Macro, and P365-380. 

The K series Holosun has a modified RMSc footprint. So it’s similar to an RMSc footprint but slightly different. For some pistols you need an adapter plate or some kind of modification but luckily for the Sig P365x, P365xl, P365X-Macro, and P365-380 it’s a direct fit - no modification is needed.

Here is some more detail about the Holosun sights we recommend for the Sig P365x, P365xl, P365 X-Macro, or P365-380.

1. Holosun 407K X2 Red Dot

Holosun 407K X2 Red Dot

The 407K comes with a 6 MOA dot only. So it’s a little bigger than the typical 2 MOA dot, but that's pretty nice for close range.

Read our full 407K review here.

Buy the 407K Red At The Best Price

2. Holosun 507K X2 Red Dot

Holosun 507K X2 Red Dot

The 507K comes with the multi reticle system. Which is Holosuns circle plus dot combination. The 507K has a 32 MOA Circle with a 2 MOA dot. The multi reticle system lets you cycle through these so you can use only the 32 MOA Circle, or only the 2 MOA dot if you choose to do so.

The 32 MOA Circle gives the 507K a slight edge when picking up the dot upon drawing from your holster.

Besides those differences both optics are exactly the same. They have the same dimensions, the same batteries, same housing, etc. The only difference is the reticle and the 507K, when using the 32MOA + 2MOA Dot, is rated at 20k hours of battery life vs the 50k if using the dot only. The 407k is rated at 50k hours of battery life.

Read our full 507K review here.

Buy the 507K Red At The Best Price

3 & 4. Holosun 407K X2 Green Dot and 507K X2 Green DotHolosun 407K X2 Green DotHolosun 507K X2 Green Dot

Both of these optics come in green dot versions as well. The science behind the green dot is that it’s easier for your eyes to pick up, some people say it’s brighter, and some people say it also helps with the “starburst” issue you encounter if you have any astigmatism.

Read our full 407K review here.

Read our full 507K review here.

Buy the 407K Green At The Best Price Buy the 507K Green At The Best Price

5. Holosun 507K ACSS Vulcan Green & Red Dot

Holosun 507K ACSS Vulcan

Buy the 507K ACSS Vulcan At The Best Price

The 507K ACSS Vulcan 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 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.

6. Holosun EPS Carry - Closed Emitter Option


*Note: If you plan on getting the EPS Carry for your P365, it will mount directly to your slide with the included screws, however you will need to use the included adapter plate as the screws are slightly too long to sit down tight without it. If you want to eliminate the need for the adapter plate you can buy these EPS Carry P365 Screws which let you tighten down the optic without the need for the adapter plate.

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. 

Read our full EPS Carry review here.


  • 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 comes in red or green reticles.

There are 3 versions of the EPS Carry. 

A 2 MOA Dot, 6 MOA Dot, and MRS version.

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. 

Buy the EPS Carry At The Best Price

To buy these sights at the best price or to learn more about them check the links below.

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 (EPS Carry 2 MOA): 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 (407KEPS Carry 6 MOA): 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) (507K, EPS Carry MRS: 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 (507K ACSS Vulcan): 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”


We hope you found this guide helpful, if you have any further questions please reach out to us on chat.

comment 3 comments

JJ calendar_today

Looking for a red dot for an X Macro. Helped immensely. Thanks.

Freedom Gorilla calendar_today

Rodney we agree .. it’s very confusing. But the Sigs and the Equalizer both have the “modified RMSc” footprint which will accept the K series and the EPS/Carry series with no issues.

Rodney calendar_today

Thank you, finally a well written article that eliminates the confusion about the name of the mounting system on our guns. I wish Sig would have mentioned something like,,,, “Oh by the way, your mounting system is called an RMSc”. I had a hard time figuring out if the Holosun was a direct bolt on, without an adapter plate for my guns. I do have a S&W Equalizer with the same bolt pattern, so I assume the 507k will be a direct mount to that gun also. Once the new Vulcan system with the giant circle and the dot get to the 507k green, I’ll be ready to buy a few of them.

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