Holosun 507K X2 Review

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Hey shooters! Welcome back to my Holosun 507K X2 Review in 2023.

If you follow my blogs, you must know I’m a big fan of Holosun optics. So when I got my hands on their new Holosun 507k red dot sight, I was excited to check it out and share with you guys its in-depth review.

So, Today I am gonna talk about the front runner of the small red dot sites from Holosun, which is none other than Holosun 507k X2.

Let’s get started!

Holosun 507k Review – Best Mini Red Dot

Holosun made quite a splash in the industry when they first came out with durable pistol optics that are half the price of the best red dot sights available on the market.

Holosun 507K X2 is a little brother of Holosun’s highly popular HS507c open red dot sight. Holosun shrinks the footprint of 507K X2 to make it more versatile for mounting on compact pistols.

The Holosun 507K X2 red dot sight is one of the market’s lightest and most rugged micro red dot sights.

Buying Options:

Holosun 507K X2
Holosun Sub-compact HS507K-X2 Red Dot Sights
Holosun HS507K X2 Reflex Sight
Holosun HS507K X2 Compact Multi-Reticle Circle Dot Open Red Dot Sight
HS507K-X2 Reflex Sight
Holosun HS507K-X2 Compact Pistol Red Dot Sight
Holosun 1X Micro Red Dot Sight – HS507K-X2

Holosun 507K X2: Core Specifications

Reticle ColorRed
Reticle2 MOA Dot & 32 MOA Circle
hs507k x2 footprintRMSc
Parallax Freeyes
Unlimited Eye Reliefyes
Battery Life (Hours)
Brightness Setting
Ten daylight and 2-night vision
Battery type

What you’ll get out of the box

Inside the box, you will find:

  • Holosun 507K X2
  • Two screw sets
  • Allen key
  • user Manual
  • Cleaning cloth
  • single CR1632 battery

First Look & Impression

Right out of the box, it feels like the frame is made of high-quality material that feels very solid and durable. The corners have been rounded for safety, which helps avoid any potential damage to precious Lens.

When I took the Holosun 507K X2 for the first time in my hand, it was much lighter than I thought. It just weighs 28 grams with the battery. The first thing that I noticed was how small it was.

Guys, The Holosun 507K X2 is small!

Who should get this sight

The Holosun 507k X2 is an amazing red dot sight for compact pistols. I highly recommend this to anyone who wants a small, rugged, lightweight micro red dot sight for their pistol.

Suppose you have a skinny concealed carry gun and are looking for budget-friendly optics that don’t sacrifice quality or performance. In that case, the Holosun 507k X2 is a great option. You can also use it as an offset backup sight.

you should use this optic if you have

  • compact pistol
  • skinny thin slide handguns
  • 1911 users

Holosun 507k Features

  1. Reticle
  2. Window Size
  3. Battery Life
  4. housing
  5. holosun 507k x2 footprint

1. Reticle

The Holosun hs507k x2 has a multiple reticle system that features three different reticles 2 moa dot, 32 moa circles, and a combination of both. You can choose between red or green color.

I like the option to have different reticles because it gives me more versatility for different scenarios. I usually use the dot only for close-range target acquisition and switch to the circle when I need to engage targets at a longer distance.

With 32 moa circle, you can easily engage targets even if the dot is off-centered. The circle will help you guide the dot back to the center for a more accurate shot.

The reticle is also very bright and crisp, even in direct sunlight. I haven’t had any issues with washout or blurriness.

How do you change the reticle?

You’ll need to hold down the “-” button for 3 seconds, and then you can cycle through all of your options with just one press!


When I tested this on my Glock 43x Mos, I enjoyed the 32 moa circle/dot combo for long-range shooting. I was able to acquire targets quickly and easily. The red dot was very bright and crisp, even in direct sunlight. I didn’t have any issues with washout or blurriness.

2. Window Size

The window size of holosun hs507k x2 is 0.58″ X 0.77″.

Holosun HS507k and Holosun HS507c are almost the same. The difference is 0.26″ in width and 0.59″ in height, but it doesn’t feel too small when you look through it. Holosun did a great job with the size of this window. It’s big enough to acquire targets quickly and easily without feeling like you are looking through a tiny peephole.

Can you find the dot easily?

Many people worried that the smaller window might make it more difficult to find the dot, but I didn’t have any problems with that. The red dot was still very easy to see, even when I moved around a lot.

Is Practice Required – Just like with any other red dot sight, you will need to practice a little to get used to looking for the dot in the window. But it’s not a big deal once you get the hang of it.

Window Test

when I mounted this on my Glock 43x, I got a good field of view. I had no problems with the dot being too small or hard to find. The sight picture was clear, and I had no issues with the window size.

The only time I had a problem was when I tried to shoot with both eyes open, but that’s more of a user error than anything else.

3. Battery Features

The Holosun 5070k x20 runs on a single CR2032 battery and has a battery life of up to 50,000 hours. That’s pretty impressive!

Easy side battery access – one of the best things I liked about Holosun 507k x2 is that you can change the battery without removing the sight from your gun. That’s a huge plus in my book.

To change the battery, just unscrew the side tray with the help of the Allen key and change the battery from easy side access without any hassle.

You can get four years of use out of the battery before you need to replace it. Still, I recommend replacing your batteries every year just for good measure.

Battery Test

I have to say that I’m impressed with Holosun’s battery life. I’ve been using it for a few months and haven’t had to change the battery yet. It’s still going strong, and I don’t see any deterioration in performance.

But, be careful when you change the battery because if you don’t put the side tray back on correctly, it can cause the sight to lose zero. So make sure you screw it on tightly and check to see if it’s flush with the sight body before you shoot.

4. Housing Construction

Holosun 507K X2 has one of the most solid and durable housings I’ve ever seen on a red dot sight. It’s made of the highest grade material, 7075 aluminum. The frame of the Lens has straight cuts and rounded corners to withstand a huge amount of physical impact and direct it away from your glass.


I haven’t done a drop test. I am sorry, but I can say that I have shot hundreds and hundreds of rounds with this sight mounted on my Glock 43x and Springfield Hellcat without any issues. The sight has held up well, and I haven’t had any problems with it.

5. Footprint

The Holosun 507K X2 features a shield RMSc footprint.

The Holosun 507k X2 footprint is very small, making it perfect for mounting on compact pistols like the Glock 43x and the p365.

The only complaint people have about this sight is that it’s close to an RMSc but not the same due to its front and rear mounting lug slots.

To install this sight on subcompact pistols, you must buy an additional CHPWS mounting plate.


  • crisp sight picture
  • long battery life
  • side battery tray
  • easily fits in holsters
  • replaces rear sight


  • The battery side tray screw is too small
  • difficult to shoot with both eyes open

See Comparison of Holosun 407k vs 507K

Is Holosun 507K X2 good for Conceal Carry?

Yes, Holosun 507k X2 is purely designed for concealed carry. The sight is very small and low profile, making it perfect for concealed carry.

The only downside of 507K as an open emitter sight is that dirt particles, hair, and other debris can fall into the opening while holstered under your cloth, no matter how much you try to keep it clean.

As far as concealment is concerned, I think Holosun 5070k X20 is one of the best red dot sights for concealed carry on the market right now.

Holosun 507K X2 Review – Video


I had a great experience with the Holosun 5070k X2, and I highly recommend it to anyone looking for a red dot sight for their subcompact pistol. It’s a great sight, and it will serve you well.

If you want a sight designed for concealment and small enough to fit in your holsters, then Holosun 507k X2 is the way to go.

HOLOSUN HS507K X2 Multi-Reticle Red 2 MOA Dot & 32 MOA Circle Open Reflex Pistol Sight - Durable Shake-Awake Parallax-Free Aluminum Sight for Subcompact Handguns
  • HOLOSUN RED DOT SIGHT - The HS507K X2 is an open reflex...
  • HIGH PERFORMANCE - This red dot sight features...
  • MULTI-RETICLE SYSTEM - This Holosun sight is equipped...
  • SHAKE AWAKE TECHNOLOGY - Extends battery life by...
  • SPECIFICATION - Reticle: Red 2 MOA Dot & 32 MOA Circle;...

See My Comparison of Shield RMSc And Holosun 507K.


Is Holosun 507K good?

The Holosun 507K is a great red dot sight for concealed carry. It’s small and low profile, making it perfect for carrying your gun in a holster.

What does the Holosun 507K X2 Fit?

The Holosun 507K X2 fits most subcompact pistols. Holosun 507K is a perfect fit for the Shield RMSc/RMS, Sig Romeo Zero footprint. It can also be used with mounting plates to customize your optic on any gun.

Is Holosun a Chinese company?

No, Holosun is an American company. However, their products are made in China.

How good are Holosun optics?

Holosun optics are some of the best on the market. They offer great clarity and durability.

What is Holosun 507K X2 made of?

The Holosun 507K X2 is made of 7075 aluminum. This high-grade material makes the sight extremely durable and able to withstand a lot of abuse.

How do I mount the Holosun 507K X2?

The Holosun507K X2 can be mounted with the included screws and wrench, or you can purchase a CHPWS mounting plate to customize your optic on any gun.

How do I zero the Holosun 507K X2?

To zero the Holosun 507K , you will need to adjust the windage and elevation screws. The screws are located on the side of the sight. Use the included wrench to turn the screws until the dot is centered in the window.

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I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

4 thoughts on “Holosun 507K X2 Review”

    • If you’re wondering about fitting the Holson 507k onto a Springfield Echelon, unfortunately, that’s a no-go. They’re not compatible.

    • Yes, the Holosun 507K X2 will mount directly onto your Mossberg 940 JM Pro Tactical, no extra plate needed. and based on past experiences with Holosun, it should handle the 12 gauge recoil just fine. So, you’re good to go.


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