Holosun 507C X2 Review [Initial 500 rds]

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.

This is by far the best product that comes close to the Trijicon RMR. Does it hold up to the hype?

Let's find out

Core Specs

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


holosun 507c x2 packaging

You get:

  • Holosun 507C X2
  • Battery
  • Manual
  • Lens cloth
  • Battery compartment tray tool

Who Is This For?

The Holosun 507C X2 is for:

  • Conceal carry users
  • Optic ready pistols
  • Subguns & shotguns
  • Anyone looking for a Trijicon RMR alternative
holosun 507c x2 on benelli m4
benelli m4 surefire m600 holosun 507c

Check out more Benelli M4 with other optics here

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.

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.

Check out this POV parallax test between 507C and 507K. Uses the same reticle, but different window sizes.

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 dots

1 MOA / click feels very positive with total +/- 50 click range

The user can use the provided tool for positive click adjustment or use a shell casing lip.

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 how much solar juice can you get?

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. 

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.

Final Verdict


  • 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


  • Not much really
  • Small adjustment buttons for users with big hands