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Holosun 507C X2 Review - Is it the best value RMR pistol optic?

Holosun 507C X2 MRS Red & Green Dot Sight Review - Is it the best value RMR pistol optic?

Hey Freedom Gorillas, today we are going to talk about the Holosun 507C X2. This is one of the most jam packed RMR footprint optics Holosun Makes. With its hefty feature set and MRS reticle it is a tremendous value for the money.

We understand that not having these optics in front of it can make it difficult to decide which to get. With this review article we aim to give you more information to help you make the right decision for your use case.

The red dot version is $309.99 and green dot version is $339.99.

Holosun 507C X2 Red & Green side by side

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The Holosun 507C X2 comes in red or green reticles and has the MRS reticle which is a 32 MOA outer ring and 2 MOA center dot. The housing is made out of 7075 T6 aluminum and the footprint is an RMR footprint. It has long battery life, great water proof ratings, shake awake, and a side removable battery tray. The MRS reticle lets you toggle between a 2 MOA dot only, 32 MOA circle only, or both together.

Holosun 507C X2 boxes side by side - red and green

Buy the 507C X2 Red Dot at The Best Price Buy the 507C X2 Green Dot at The Best Price

Other quick stats and dimensions on the Holosun 507C X2 are as follows:

  • Open Reflex Sight (Read more about open vs closed emitters optics here)
  • RMR Footprint
  • MRS Reticle: 32 MOA outer ring + 2 MOA center dot, configurable
  • 10Khrs of battery life with MRS reticle, 50K hrs of battery life with 2 MOA dot only on setting 6
  • 12 Brightness Setting: 10 Daylight & 2 Nightvision Compatible
  • Manual & Auto Brightness Modes
  • Convenient Side Battery Compartment
  • 7075 T6 Aluminum Housing
  • Solar Failsafe
  • Parallax-free & Unlimited Eye Relief
  • IP67 Waterproof
  • Shake Awake™
  • Multilayer Reflective Glass
  • 1 MOA Adjustment per Click
  • CR1632 Battery
  • Window Size: .63" High, .91" Wide
  • Optic Size: 1.78"L, 1.14"H, 1.24"W
  • Weight: 1.5 oz

Holosun 507C X2 Reticles

The Holosun 507C X2 comes in both red and green reticles and has Holosuns Multi Reticle System (MRS). The MRS Reticle is three reticles in one. You get a 32 MOA outer ring, a 2 MOA Center dot, and can use just the 32 MOA ring only.

To toggle the reticle, you hold down the "-" button for three seconds and the reticle will change.

MRS Reticle how to toggle

The MRS reticle is nice if you want flexibility. The larger outer ring helps you "find the dot" and the 2 MOA center dot is small and precise.

The green version is slightly more expensive.

Holosun 507C X2 Red & Green MRS Reticle - side by side

Holosun 507C X2 Pricing & Models

The Holosun 507C X2 comes in red or green reticles and has the MRS reticle.

You can learn more about red vs green dots here.


Holosun 507C X2 Red Dot Sight


Buy the 507C X2 Red Dot At The Best Price


Holosun 507C X2 Green Dot Sight


Buy the 507C X2 Green Dot At The Best Price

Holosun 507C X2 Dimensions & Size

Holosun 507C X2 Dimensions, Size, Weight
  • Deck height: 8.72MM
  • Width: 1.24"
  • Length: 1.78"
  • Height: 1.14"
  • Window Size: .91" Wide, .63" Tall
  • Weight: 1.5 oz

Holosun 507C X2 Footprint

The Holosun 507C X2 is an RMR footprint optic. This means it will fit on any RMR footprint slide or adapter plate.

Holosun 507C X2 RMR Footprint example and RMR cut slide picture

Holosun 507C X2 Intended Use

The Holosun 507C X2 is an RMR footprint optic and a regular sized pistol red dot. This means it is intended for use on any pistol with an RMR footprint or RMR adapter plate. Most of the time this means the pistol will be a full size or compact such as a Glock 19 MOS or a S&W M&P 2.0. Make sure you know what footprint your gun is. The 507C X2 is not intended for and usually will not fit any micro compact pistol like a Glock 43X MOS or Sig P365. For the smaller pistols you want to look at the 507K X2 this is because the smaller micro compact pistols usually come with a different footprint like the RMSc or K series footprint.

The 507C X2 can also be used as a rifle optic, PCC optic, or backup scope optic if you get an "RMR" picatinny or offset adapter found here.

In the Holosun 507C X2 Box

When you open the Holosun 507C X2 this is what you will find in the box:

  • 1x CR1632 Battery (installed inside the optic)
  • Holosun Warranty Card
  • Holosun Battery, Screws, & Adjustment Tool
  • Holosun Manual
  • 4x 6-32 Screws (short), 4x 6-32 Screws (long)
  • 507C X2 Optic
  • Lens Cloth

Holosun 507C X2 Screws & Batteries

Here is an up close photo of the Holosun 507C X2 Screws, Battery, and Tool that come in the box. The battery will be pre-installed in the optic.

Holosun 507C X2 Screws, Battery, and Tool

Holosun 507C X2 Fitment Info & Adapter Plates

Below is information on mounting the Holosun 507C X2 Reflex Sight on different pistols. Some pistols require adapter plates to make it fit. The table below is for Optics Ready pistols only. If you do not have an optics ready pistol and still want to mount a 507C X2 to your platform, you can get a dovetail mount which replaces your rear dovetail sights. Find all our dovetail mounts here.

*Note: Clicking on the pistol name below will take your to our fitment guide which explains more about each platform.

Anderson Manufacturing

Arsenal Democracy

Bul Armory



Heckler & Koch


Palmetto State Armory

Shadow Systems

Smith & Wesson

Staccato 2011



Wilson Combat







Nighthawk Custom

Sig Sauer

Springfield Armory




Don't see your model listed? Check out our Fitment Guides Here.

Holosun 507C X2 Review & Highlights

The Holosun 507C X2 is one of Holosuns best selling RMR footprint optics and for good reason. For the price and the features you get, it is a tremendous value.

The 507C X2 is very similar to the cheaper 407C X2 however it has the Multi Reticle System (MRS) which most people seems to like a lot. We believe this is mainly because it gives you the larger 32 MOA outer ring and also the 2 MOA center dot, but then it gives you the added flexibility of using only the 2 MOA dot or only the 32 MOA circle.

Holosun 507C X2 mounted and co-witness - Glock 19 w/ p80 RMR slide

From personal experience, the 32 MOA outer ring is helpful for “finding the dot” when moving or when drawing the weapon.

In addition to the reticle, the features of the shake awake, side removable battery, 7075 aluminum housing, long battery life, and IP67 waterproof rating make the 507C X2 the leader in the market when it comes to price to value ratio.

The 507C X2 also has a solar panel at the top which gives you the solar failsafe feature which means even if your battery dies the optic will still work (it will use whatever juice it has in the capacitor if there is no direct light). The solar panel also gives this optic an additional “auto brightness” feature.

Personally I find auto brightness mode very convenient. If you are going outdoors to indoors the auto brightness is very handy. The 507C X2 has auto brightness and manual brightness, you can use either mode.

Overall the 507C X2 has just about every feature you could want in a pistol optic.

Holosun 507C X2 Red Dot Sight


Buy the 507C X2 Red Dot At The Best Price

Holosun 507C X2 Green Dot Sight


Buy the 507C X2 Green Dot At The Best Price

Holosun 507C X2 Downsides

The Holosun 507C X2 doesn’t have too many downsides. In our Holosun 407C X2 review we compared the 407C X2 to the Trijicon RMR Type 2 Adjustable LED. Since Trijicon just released the Trijicon RMR HD with a similar reticle to the 507C X2 we can use that as a comparison.

If you are to compare the 507C X2 to the Trijicon RMR HD then the only “downside” to the 507C X2 is that the Trijicon RMR HD will beat it in terms of durability when it comes to drop tests. The RMR HD has a patented housing design that is made to absorb drops better than most other optics made out of the same material.

The 507C X2 can still withstand drops, and is still extremely durable but if you compare it to the Trijicon RMR HD or the Holosun 508T X2 the 507C X2 will be slightly less durable when dropped right on its head.

It’s worth noting that the Trijicon RMR HD and the Holosun 508T X2 are both more expensive than the 507C X2. 

Holosun 507C X2 Warranty

Holosun has a limited lifetime warranty. Basically everything is covered for the lifetime of the optic except for the electronics, that is covered for 10 years.

We’ve dealt with Holosuns warranty department and they are easy to deal with.

Also when you purchase from Freedom Gorilla, if you have an issue within 30 days we will replace the optic for you free of charge, including return shipping.


The 507C X2 is a great “do it all” RMR footprint optic. You can use it for EDC, competition, plinking, or even duty use.

It’s strong, has almost every feature a pistol optic could have, and does it at an affordable price point compared to other options on the market. It’s backed by Holosuns limited lifetime warranty, and there are so many in circulation that its track record speaks for itself.

If you have any further questions please reach out.

Thanks for reading!

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