Holosun 407K-X2 Micro Red Dot Review

This review covers everything you need to know about the 407K, including its features, performance, and value. By the end of this review, you’ll know if the 407K is the right sight for you. Let’s start by taking a look at the specs.

407k Specifications

The 407K is a micro red dot sight (RDS) with a 6 MOA dot reticle. It has an aluminum 7075 T6 housing and is IP67 waterproof rated. The sight runs on a CR1632 lithium battery and has a 50,000-hour battery life.


The Holosun 407K-X2 weighs about 1 ounce and has a length of 1.6 inches. Its width and height are both under 1 inch. The window measures 0.58 by 0.77 inches.


The sight has a black anodized finish for enhanced durability.


Elevation and windage adjustment screws are located on the top and right side of the sight, respectively. Each click results in a 1 MOA shift in point of impact.


The sight comes with a low profile mount that uses a modified footprint found of the Shield SMS and RMS dot.


Now that we’ve covered the specs, let’s see what the Holosun 407K-X2 comes with.

What’s Included in the Box

In the box, you’ll find:


  •       The 407K-X2 optic
  •       CR1632 battery
  •       User manual
  •       Lens cleaning cloth
  •       Adjustment tool
  •       Screws with pre-applied blue Locktite


The included screws are for mounting the sight. The screws have pre-applied blue Locktite, so there’s no need to worry about them coming loose.


The 407K is covered by Holosun’s limited lifetime warranty. If anything goes wrong with the sight due to the manufacturer's defect, Holosun will repair or replace it at no charge.

Battery Life & Brightness

The Holosun 407K-X2 has a long battery life that provides up to 50,000 hours on setting 6. You’ll find that the battery is easily accessible through the built-in tray.


You can control the sight’s brightness via two flush-mounted plus and minus buttons located on the left side of the unit.


There’s an auto-off feature called “Shake Awake” that conserves battery power when the sight is not in use. The sight will automatically turn off after 10 minutes if it doesn’t detect any movement.

Reticle and Settings

The 407K features 12 brightness settings, including 10 daylight and two night vision settings. The 6 MOA dot is very visible, even in bright daylight. The dot is crisp and doesn’t wash out when you move your eye around the sight.


The settings are easy to adjust, even with gloves on. Simply press either plus or minus to adjust the brightness to your liking. You can also press in both buttons at the same time to shut off the sight.


The Holosun 407K-X2 is a great option for those who are looking for a micro red dot sight for their pistol. It is a well-made sight that is durable and has a clear lens.


It is easy to mount on pistols with slide-mounted red dot sights, and it is a great value for the price.


The only downside of the Holosun 407K-X2 is that it is not compatible with night vision devices. However, this is not a major issue, as the sight can still be used during the day.


But let’s take a closer look at how this sight performs so that you can better determine if it’s what you’re looking for.


The Holosun 407K-X2 is a great performing sight. The 6 MOA red dot is extremely clear, and the 50,000-hour battery life is impressive.


Even on some of the lower brightness settings, the red dot is still visible in direct sunlight. The sight is also very rugged and can withstand a lot of abuse, making it a great fit for a duty or combat pistol.


There is no need for a front sight, so target acquisition is quick and easy. This is sure to be a favorite among competitive shooters and those who like to train with red dot sights in general.


The first thing you’ll notice about the Holosun 407K-X2—aside from its compact size—is that it is a very well-made sight.


The body of the sight is constructed from aluminum, and the lens is clear and scratch resistant. The sight is also extremely lightweight, making it easy to mount on your pistol.


There are Picatinny and weaver mounting plates available for the sight, and it comes with a modified version of the Shield mounting plate that will fit most pistols. The sight is also compatible with most red dot sights on the market.


You’ll notice the build quality immediately after taking the 407K-X2 out of the box. This is a sight that is built to last, and it shows in the construction.


Adding to its durable build is IP67 waterproofing, meaning that the sight can be submerged up to 1 meter for 30 minutes without issue.


This makes the 407K-X2 a great choice for concealed-carry guns that may be exposed to the elements.

Ease of Use

The Holosun 407K-X2 is an extremely easy sight to use. The sight is turned on and off via the two flush mount buttons, which also control the unit’s brightness settings.


For windage and elevation adjustment, the sight features two screws on the top and side of the unit. These screws can be adjusted with a flathead screwdriver or coin, but you get a multitool included in the box that makes this process much easier.


The sight also comes with a battery, so you can start using it right out of the box. It’s a breeze to replace, too, thanks to the tray.


The 407K-X2 is an extremely user-friendly sight, and even if you’ve never used a red dot sight before, you’ll be able to figure it out quickly.


So it’s ideal for beginners, but seasoned pros will appreciate the sight’s features, as well.

How to Zero in the Red Dot

Please note that the 407K-X2 comes standard zeroed in for 25 yards. If you want to adjust the red dot to be zeroed in at a different distance, you can use the two turrets on the sight to do so.


The elevation turret can be used to adjust the point of impact up or down, and the windage turret can be used to adjust the point of impact left or right.


To adjust the red dot to be zeroed in at a specific distance, first find the distance you want to zero in at. Then, using the elevation turret, turn the knob up or down until the point of impact is at the desired location.


Once you have done that, use the windage turret to adjust the point of impact left or right until it is also at the desired location.


The Holosun 407K-X2 is a great micro red dot sight. It has all of the features that you would want in a reflex sight, and it is small enough to be used on a variety of different firearms.


The only downside is that it does not come with a mount, so you will need to purchase one separately if you need to mount it to a Picatinny or Weaver rail.


But aside from that one caveat, the Holosun 407K-X2 is a great reflex sight for the money that’s sure to serve you well.


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