Hey Freedom Gorillas today we are going to compare the Holosun 507C X2 and the Holosun 507K X2. We understand that not having hands on experience with each of these optics can make it hard to understand how they are similar and how they are different.
The 507C X2 and the 507K X2 are the upgraded versions of the C and K Series optics that feature the MRS Reticle (Multi Reticle System).
TLDR: The main difference between the 507K X2 and the 507C X2 is that the 507C X2 is an RMR Footprint and the 507K X2 is a K-Series footprint. The 507K X2 is intended for use on smaller sub compact and micro compact pistols while the 507C X2 is intended for more full size and compact pistols. The 507C X2 also has a solar failsafe while the 507K X2 doesn't.
*Note: Some optics ready pistols have adapter plates or mounting solutions that let you mount the 507C X2 or the 507K X2. Use our fitment guides or adapter plate finder to learn more.
Quick Nav
- Holosun 507C X2 vs 507K X2 Models & Pricing
- Holosun 507C X2 vs 507K X2 Footprint
- Holosun 507C X2 vs 507K X2 Size & Intended Use
- Holosun 507C X2 vs 507K X2 Deck Height
- Holosun 507C X2 vs 507K X2 Reticles
- Holosun 507C X2 vs 507K X2 Battery Life
- Holosun 507C X2 vs 507K X2 Similarities
- Holosun 507C X2 vs 507K X2 Differences
- Holosun 507C X2 vs 507K X2 Which is Better?
- Holosun 507C X2 vs 507K X2 Conclusion
Holosun 507C X2 vs 507K X2 Models & Pricing
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Starts at $309.99 
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Starts at $295.99 
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Holosun 507C X2 vs 507K X2 Footprint
The most important thing to know is that the 507C X2 is an RMR footprint and the 507K X2 is an K Series footprint a.k.a modified RMSc footprint.
Because of this you will need to know the optics cut of the pistol you are trying to mount these on. If you have a compact or full size pistol then chances are you may have an RMR cut and would use the 507C X2 … if you have sub or micro compact pistol then you may have a RMSc or Modified RMSc footprint in which case you’d want the 507K X2. Check out our fitment guides to find your specific gun to see which optics fit it and if you need an adapter plate or not. And if you need help figuring out if you have an RMSc or K Series footprint read our RMSc vs Modified RMSc guide here.
You can see in the image below both optics have different footprints, meaning they have different screw hole locations and recesses for recoil lugs. This is why it's imperative you know the footprint of your optics ready pistol before purchasing one.
Holosun 507C X2 vs 507K X2 Size & Intended Use
As mentioned above, the 507C X2 is a larger pistol optic and the 507K X2 is a micro pistol optic. Larger optics like the 507C X2 are intended for use on pistols in the full size and compact size category. That is also why it is an RMR footprint. Many full size or compact optics ready pistols come with an RMR plate or slide cut.
The 507K X2 comes with a K-Series a.k.a. modified RMSc footprint. Most sub and micro compact optics ready pistols have either an RMSc or K-Series footprint. If you aren't sure what optic cut you have find your pistol on our fitment guides to learn more.
You can see by the photos below that the 507C X2 has a larger size and window than the 507K X2. You will also notice the 507C X2 has a solar failsafe, and the 507K X2 does not. The solar failsafe also gives the 507C X2 an automatic brightness mode. This means the 507C X2 has automatic and manual brightness whereas the 507K X2 has manual brightness mode only.
Holosun 507C X2 vs 507K X2 Deck Height
The Holosun 507C X2 has a higher deck height than the 507K X2. This means if you have a platform that will let you mount either of these optics, then the 507K X2 will sit slightly lower allowing you to see more of your iron sights.
Holosun 507C X2 vs 507K X2 Reticles
The reticles on the 507C X2 and the 507K X2 are the same. They both use the MRS reticle which is Holosun's Multi Reticle System. This reticle has a 32 MOA outer ring and a 2 MOA center dot.
The reticle can be configured to show just the 32 MOA outer ring, just the 2 MOA dot, or both of them together like you see below.
Toggling the reticle is easy, you just hold the "-" button down for three seconds and it will change to the next reticle.
Holosun 507C X2 vs 507K X2 Battery Life
The Holosun 507C X2 and the 507K X2 have the same battery life. They are both rated at around 20,000 hours of battery life using the MRS reticle on setting 6.
If you were to use the 2 MOA dot only, the battery life would be 50,000 hours.
Holosun 507C X2 vs 507K X2 Similarities
- They both have shake awake
- They both have the Multi Reticle System (MRS)
- They both have IP67 water proof ratings
- They both have side removable batteries
- They are both made out of 7075 T6 Aluminum
- They are both available in red or green dot versions
- They both have 20K hours of battery life when using the MRS reticle and 50K hours of battery life when using the 2 MOA dot only
Holosun 507C X2 vs 507K X2 Differences
- The 507C X2 has a solar failsafe, auto and manual brightness modes, while the 507K X2 has no solar failsafe, and manual brightness mode only
- The 507C X2 is an RMR footprint, and the 507K X2 is a modified RMSc footprint
- The 507C X2 is a larger optic, it’s wider and has a slightly larger window, it’s intended for use on full size or compact handguns.
- The 507K X2 is a smaller optic, it’s more narrow and has a smaller window, it’s intended for use on sub compact or micro compact pistols.
Holosun 507C X2 vs 507K X2 Which is Better?
So which one is better? Well they are both unique in their own way. The first thing you have to do is understand what footprint your pistol has. If you have a pistol with an RMR footprint only then the 507K X2 wouldn’t fit it unless you got an adapter plate like this RMR to K Series adapter plate. And vice versa, if you have an RMSc footprint or K series footprint pistol then you wouldn’t be able to mount the 507C X2 unless you had the proper adapter plate (which doesn't really exist).
But if you have a pistol that has many adapter plates available and lets you mount either of these optics, then I think it comes down to a few things.
First look at your budget. The 507C X2 is slightly more expensive than the 507K X2 but not by much.
Second, what size window and optic do you want? The 507C X2 usually has slight overhang on the slide, whereas the 507K X2 usually is flush.
Third, do you want the solar failsafe feature and auto brightness modes? If so then the 507C X2 has this and it also has manual brightness mode. The 507K X2 only has manual brightness mode.
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Conclusion
Both optics are great and in most situations you will need to get one or the other due to your mounting footprint. However if you have a pistol that allows you to mount either by using different adapter plates then we don’t think you could go wrong with either.
Just take into the consideration the differences above and choose what you think best suits your needs.
Hopefully you found this information helpful. If you have any further questions please reach out.
Thanks for reading!
