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  • Post last modified:May 5, 2023

In this Holosun 507C X2 Review guide, let's take a look at this awesome micro red dot sight for long gun and handgun applications.

The HS507C is one of Holosun's flagship product, and I have tested many red dot sights on the range in the past 9 years. I also conceal carry daily, and the 507C is by far the best product that comes close to the Trijicon RMR. 

Does it hold up to the industry standard?

Let's find out

Check out other newer Holosun optics here

Holosun 507C X2 Core Specs

  • Window Size: 0.63x0.91"
  • Material: 7075 T6 aluminum
  • Reticle: 2 MOA dot size + 32 MOA Ring
  • Battery: CR1632
  • Battery Life: 50,000 hours (Industry standard)
  • Brightness Setting: 10 DL&2 NV
  • Adjustment: 1 MOA / Click
  • Weight: 1.5 oz

What we liked

  • Rock solid construction
  • Side battery access without sight removal
  • Reticle brightness lockout mode to prevent inadvertent button press
  • 32 MOA ring for target range estimation & shotgun applications
  • Uses the same RMR mounting footprint

What we disliked

  • ShakeAwake's battery saving feature may not be so practical for conceal carry user who is constantly moving
  • Small adjustment buttons for users with big hands
  • Turret tool required to adjust MOA in the field. Can't use shell casing or a flat head screw driver
  • Not weatherproof if using in sandy, rainy or snowy environments

Best Uses

  • Conceal carry users
  • Optic ready pistols with RMR footprint
  • Subguns & shotguns
  • Offset carbine red dot
  • Anyone looking for a Trijicon RMR alternative
  • Verdict

    The Holosun 507C X2 by now is as popular as the Trijicon RMR and it's much cheaper for people who are just getting into firearm optics. It's field durable for concealed carry and range use. The long battery life, 7075 T6 body construction, multiple reticle system and compatible RMR mounting footprint making it a top tier red dot sight to purchase.


    holosun 507c x2 packaging

    You get:

    • Holosun 507C X2
    • Battery
    • Manual
    • Lens cloth
    • Battery compartment tray tool (Don't throw this away)

    Holosun 507C X2 Core Features

    Window Size

    holosun 507c x2 front lens

    The window size is similar to the Trijicon RMR with a slightly larger area near the top of the lens frame.

    Just about couple milimeters taller to helps pistol shooters track the reticle better inside the lens.

    As far as the window width goes, it feels the same as a Trijicon RMR.

    Lens Tint

    The Holosun 507C X2 has a bit of bluish lens tint but it's not so distracting that you can't see things clearly through the lens indoor and under the sun.

    The anti reflection multi coating layers makes the lens scratch proof under normal use, and it keeps the reticle projection much more crisp on the lens for shooters with astigmatism.

    Astigmatism varies from person to person, and an optic optimized for astigmatism is only as good as the shooter's vision.

    Build Quality

    benelli m4 with holosun 507c x2 red dot
    holosun 507c x2 top view

    The black andoized Holosun 507C X2 just looks amazing and feels rock solid right out of the box no doubt.

    The mounting footprint extrusion and every corner of the body is well machined and feels like a high premium $600 optic.

    The Holosun logo is laser etched on the side of the optic. Some people like it and some people I seen on the internet completely scratch it off or white it out.

    holosun 507c on valhalla tactical rukh offset mount

    The base construction and the lens frame feel much more beefier and thicker than the Trijicon RMR for added durability.

    The hood of the lens is much longer than the RMR as well.

    holosun 507c x2 vs trijicon rmr frame comparison

    Yes it's recoil proof as we tested on a FNX 45 Tactical and a 12GA Benelli M4 under normal use.

    For more extreme testing, we recommend you check out this video:


    The 507C X2 uses a 2 MOA center dot by default, and it has the option to use:

    • 2 MOA dot ONLY
    • 2 MOA dot + 32 MOA ring
    • 32 MOA ring ONLY

    To cycle through all the options, just hold the "-" button for 3 secs.

    Make sure it's NOT in the lockout mode

    32 moa ring holosun 507c x2

    Very easy to pick up

    2 moa and 32 moa ring holosun

    The 2 MOA dot size reticle does the same thing other optics can do for precise aiming that covers a 2" diameter circle at about 100 yards.

    The 32 MOA ring can be used to:

    • Estimate known target size distances without a magnifier
    • Faster for the eye to pick up
    • Use it as shotgun spread pattern (Depends on pellet types & choke configuration)

    However, when the optic is too far forward from the eye, the reticle appears to be bigger than 32 MOA, which can skew your point of aim or sizing of a target down range.

    Brightness Lock Out Mode

    The reticle brightness lock out mode is something conceal carry users always wanted to prevent inadvertent button press under a piece of clothing that throws off the desired setting.

    Either too bright or too dim.

    • 12 brightness settings
    • 10 daylight
    • 2 night vision

    Once the Super LED brightness level is set, the user will hold the "+" button for 3 secs to save and lock it.

    The reticle will flash once and that's how you know it's saved.

    Just that simple!

    If you have astigmatism, having a wide range of brightness increment settings can help the user get the best setting that work for them.

    If you're shooting at night, please check out this guide where we break down the subtle things you need to know about using a red dot in low light environment

    Elevation & Windage Adjustments

    The elevation and windage adjustments are just like other red dot sights

    1 MOA / click feels very positive with total +/- 50 click range. However, the most frustrating part of the turret knob is that it requires a very small flat head screw driver to turn it.

    For someone that like to just pick up a empty shell casing to dial the turret, the Holosun 507C unfortunately requires a tool in your range bag if you go out zeroing. The one that is included in the packaging works just fine.

    More info on zeroing a red dot, check out this guide

    Battery Compartment

    holosun 507c x2 battery tray access

    Access the battery from the side instead of the bottom is the best design that other open reflex red dots are taking into consideration.

    holosun 507c x2 battery tray access 2
    holosun 507c x2 battery tray

    Just unscrew, pull the tray out, and replace the battery.

    Sight removal for battery placement is no longer required. This saves time re-zeroing the sight and save effort looking for tools.

    Be Cautious: The screw is very small. Don't lose it!

    holosun 507c x2 battery tray screw

    Solar Failsafe Works Like A Fiber Optic

    holosun 507c x2 solar panel

    The Solar Failsafe technology extends the battery life longer to keep you in the fight longer without ever changing the battery.

    So we tested the sight without the battery under the sun and here is what we discovered:

    The sight acts almost like a sight with fiber optic, but the reticle disappear if you block off lights to the solar panel. The only downside is that once the sight is in a dark area, it turns off and doesn't turn back on even when light returns until buttons are pressed. 

    In addition, the motion activated reticle can save battery when sitting in idle. But it's pointless when mounted on a conceal carry pistol that is constantly moving.

    Same RMR Mounting Footprint

    valhalla tactical RUKH offset mount side view

    See more offset mounts like this here

    The Holosun 507C X2 uses the same mounting footprint as the Trijicon RMR.

    So the user can mount it on any compatible handgun slides or aftermarket mounts for offset applications as well.

    offset scar 17 valhalla tactical rukh mount

    However, if the the handgun slide is cut specifically for an optic, the 507C X2 might not fit due to the cut and vice versa.


    Holosun 507C X2 Warranty Policy

    Holosun gives a limited lifetime warranty for the 507C X2. The customer service is fast and helpful. If fixing something doesn't work, then they give a new one. However, the warranty is only applies to the first buyer and can't be given to someone else. How would they know? I have no idea.

    The external part has a lifetime warranty, but the optics have a five-year warranty, and the light part is covered for three years.

    What is the Difference Between the HS507 V2 and the X2?

    The Holosun 507 V2 and X2 versions are completely different. In fact, the V2 version has been discontinued.

    The Holosun 507C X2 version has changed the bottom battery loading compartment to the side tray design. In addition, the brightness adjustment buttons are smaller.

    The reticle brightness lock mode is a very positive upgrade for conceal carry users to prevent accidental adjustments when tucked or rubbing against tight clothing or the holster.

    Overall they still feature the same RMR footprint and the functionality of the optic remains the same. 

    Can You Deactivate The Solar Cell?

    Yes, entering the manual mode to deactivate the solar cell. Press and hold the "+" button for four seconds. When the sight blinks, you know you're in Manual Mode.