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Holosun 507K X2 Review - Should you buy one?

Holosun 507K X2 Red & Green Dot Sight Review

Hey Freedom Gorillas, today we are going to cover the Holosun 507K X2 Red & Green Dot sights. We understand not having these optics in your hands can make it difficult to decide if it is right for you. So we are going to review this pistol optic the best we can so you can make an informed purchasing decision.

Holosun 507K X2 Red & Green Side by Side

The red dot version is $295.99 and green dot version is $319.99.

Ok so first things first, what makes the Holosun 507K X2 unique? The main thing is it’s MRS reticle. Which is the 32 MOA ring and 2 MOA dot. This can be toggled to use just the dot, just the ring, or the dot + ring by holding down the “-” button for 3 seconds.

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The 507K X2 is one of Holosuns best sellers. It has a modified RMSc footprint and features the MRS reticle which is a three reticle system. It has long battery life, strong 7075 aluminum housing, and comes in red or green reticles and has manual brightness. It is an open reflex sight.

Holosun 507K X2 Red & Green Dot Sight Box

Buy the Holosun 507K X2 Red Dot at The Best Price Buy the Holosun 507K X2 Green Dot at The Best Price

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

  • Open Reflex Sight (Read more about open vs closed emitters optics here)
  • Modified RMSc Footprint (a.k.a K Series Footprint) learn more here
  • MRS Reticle: 32 MOA + 2 MOA Dot, 2 MOA Dot only, 32 MOA Circle Only.
  • 10K Hours Battery Life with MRS Reticle, 50K Hrs with 2 MOA Dot only at setting 6
  • 12 Brightness Setting: 10 Daylight & 2 Nightvision Compatible
  • Convenient Side Battery Compartment
  • 7075 T6 Aluminum Housing
  • Parallax-free & Unlimited Eye Relief
  • Designed for CCW
  • IP67 Waterproof
  • Shake Awake™
  • Multiple Reticle System
  • Multilayer Reflective Glass
  • 1 MOA Adjustment per Click
  • CR1632 Battery
  • Window Size: .58" High, .77" Wide
  • Optic Size: 1.6"L, .95"H, .98W
  • Weight: 1 Oz

Holosun 507K X2 Reticles

The Holosun 507K 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.

How to change reticles on the Holosun 507K X2

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.

Holosun 507K X2 Red & Green MRS Reticles Example

Holosun 507K X2 Pricing & Models

The Holosoun 507K X2 comes in red or green reticles. The green version is slightly more expensive.

You can learn more about red vs green dots here.


Holosun 507K X2 Red Dot Sight


Buy the 507K X2 Red Dot At The Best Price


Holosun 507K X2 Green Dot Sight


Buy the 507K X2 Green Dot At The Best Price

Holosun 507K X2 Dimensions & Size

The Holosun 507K X2 is a micro pistol optic. So it is smaller in size. Here are some of the dimensions to give you a better idea of size.

Holosun 507K X2 Window Size & Optic Size & Weight
  • Deck height: 7MM
  • Width: .98"
  • Length: 1.6"
  • Height: .95"
  • Window Size: .77" Wide, .58" Tall
  • Weight: 1oz

Holosun 507K X2 Footprint

The Holosun 507K X2 has a modified RMSc footprint a.k.a. K Series footprint. This is similar to an RMSc footprint but it doesn't have rear recoil lugs. Learn more about RMSc vs K Series footprints here. The rear recoil lugs were removed to allow Holosun to seal the unit making it IP67 waterproof rated which makes it one of the best waterproof rated optics in this category. To fit it on your RMSc footprint pistol you will need an adapter plate which can be found below in our fitment table.

Holosun 507K X2 Footprint - K Series

Holosun K Series vs RMSc footprint identification and explanation

    Holosun 507K X2 Intended Use

    The Holosun 507K X2 is a micro pistol optic which means it is on the smaller size. It’s intended to be used on smaller pistols like the Glock 43X, S&W Shield, or Springfield Hellcat. It can still be used on larger pistols like a Glock 19 and S&W M&P 2.0, however to mount this on any pistol you must be aware of your pistols optic footprint. View the fitment info guide below to see how it can fit on your pistol.

    The 507K X2 can also be used a rifle optic, PCC optic, or backup scope optic if you get a "K Series" picatinny or offset adapters found here.

    In the Holosun 507K X2 Box

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

    • 1x CR1632 Battery (installed inside the optic)
    • Holosun Warranty Card
    • Holosun Battery, Screw, & Adjustment Tool,
    • Holosun Manual
    • M3 Screws, M4 Screws, (some are coming with 6-32 screws now also)
    • 507K X2 Optic
    • Lens Cloth

    Holosun 507K X2 Screws & Batteries

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

    Holosun 507K X2 Screws, Battery, Tool


    Holosun 507K X2 Fitment Info & Adapter Plates

    Below is information on mounting the Holosun 507K X2 Red Dot 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 507K 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.

    Direct Fit For These Optics Ready Guns

    Adapter Plate Required For These Optics Ready Guns

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

    Holosun 507K X2 Review & Highlights

    The Holosun 507K X2 is the most premium micro pistol optic Holosun Makes. Compared to the 407K X2 the main difference is that it has the MRS reticle instead of the 6 MOA dot that the Holosun 407K X2 has.

    Holosun 507K X2 Mounted - Co-Witness - Size

    The MRS reticle is nice. The larger outer ring helps you find the dot a bit easier than just a regular 2 MOA dot, and it also can be toggled, so you essentially have 3 reticle options.

    If you are just getting into pistol red dot sights the 507K X2 is a good first choice. It will give you the precision of a 2 MOA center dot, and you can also test out the larger outer ring to see if you find that helps with your aim and with “finding the dot”

    The Holosun 507K X2 is also extremely durable with its class leading 7075 T6 Aluminum housing. The side removable battery tray is also very convenient for when you need to replace the battery.

    When you compare the 507K X2 to other optics in the market you won’t be able to find anything close to it for the money. That is Holosuns true value, the amount you pay, for the features, quality, and track record of their optics cannot currently be beat.

    We really like the Holosun 507K X2. It’s a great all around micro pistol red dot, and the best in its class with its MRS reticle.

    Holosun 507K X2 Red Dot Sight


    Buy the 507K X2 Red Dot At The Best Price

    Holosun 507K X2 Green Dot Sight


    Buy the 507K X2 Green Dot At The Best Price

    Holosun 507K X2 Downsides

    The only real downside to the Holosun 507K X2, and Holosuns K series and EPS Carry series optics, is that they are a modified RMSc footprint. Which means for some pistols you will need an adapter plate. For example the Springfield Hellcat and Glock 43x. This will cause the optic to sit a bit higher and will obstruct your irons sights.

    This can be fixed with getting taller iron sights, but it is something worth noting.

    If this is a deal breaker for you you can check out the Vortex Defender CCW. It doesn’t have the same reticle, but it will mount directly on a regular “RMSC” footprint slide if that is a top priority for you.

    Holosun 507K 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 not a hassle 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.


    The 507K X2 is one of Holosuns best selling optics. And for good reason. It gives you the multi reticle system, long battery life, a strong housing, and great features.

    It is a great “all around” pistol optic and almost everyone that gets one loves it.

    We hope you found the information in this guide helpful and if you have any further questions please reach out to us!

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