Holosun HS403B review


The Holosun HS403B is a fine choice for its price range, as it comes equipped with innovative technology, which makes it easy to use, a good example being the shake wake feature, which helps save on battery and intelligently powers the unit when movement is detected. The unit is highly versatile to be used with different firearms and is compatible with the standard mounts.

The above information is to help you settle with a functional optical sight for the respective application, but there are some other important missing information that would help cement the deal. Information on how the unit holds up during abuse is quite important as it will help you select an optical sight that can take the beating of the environment with which you are going to use the sight.

So, before you pay for the sight, find out how it fairs on when exposed to different temperatures, can it be used in moist conditions, what about impact, is it able to hold zero even after being exposed to high impact. Information on the construction should be availed and whether it can seamlessly restrict dirt from penetrating the sight. Let us, therefore, see how the Holosun HS403B performs as regards the above information.

Holosun HS403B review and breakdown

Just like most of the highly-rated red dot sights in the market, the Holosun HS403B is shockproof. This allows you to always have an accurate aim on your target every time you use this red dot sight. Well, most rifle users usually prefer purchasing these shockproof red dot sights because they absorb recoil effectively. Therefore, you will be guaranteed maximum accuracy throughout regardless of the gun you are using which serves as an advantage especially when you go hunting.

Another useful feature that comes with this red dot sight is that it is IP67 rated. This basically means that it is waterproof and will still operate efficiently even when you use it underwater. In addition to this, it is also equipped with a low mount and high mount which makes it easy to attach it to any type of gun. These mounts make this red dot sight compatible with a variety of guns even though they have different mounting points. This is also convenient if you have a number of guns as you can use this same red dot sight on all your guns and it will still deliver great performance.

It is also pretty easy to change the battery on this Holosun HS403B red dot sight as it comes with a battery tray on the side of the housing. All you have to do is open the battery tray remove the old battery and replace it with the new battery. This serves as a major benefit because you’ll always be able to switch batteries without unmounting the red dot sight from your gun. It is also pretty convenient as you won’t have to redial your preferred settings on the red dot sight all over again.

The Holosun HS403B also comes with a 5-year warranty on the housing and a 3-year warranty on the electronics. For sure, this shows you how confident Holosun are with this product.

What we liked;

  • It comes with a long battery life.
  • It is compatible with a wide variety of guns.
  • It is very easy to mount.
  • It has a sturdy construction.

What we didn’t like;

  • It is difficult to unscrew the battery tray.

Holosun HS403B specifications

Holosun HS403B
Red dot sight
2.45 x 1.43 x 1.6 inches
Eye relief
Water resistance
IP67 waterproof
Battery life
50,000 hours
100 yards
Housing material
606 T6 aluminum

Holosun HS403B features

Design and structure

This red dot sight measures 2.45 x 1.43 x 1.6 inches and weighs 2.82oz which makes it suitable for use on a wide variety of guns. This includes handguns, rifles, and even shotguns.  We tried it on our hunting rifle and we didn’t feel any significant addition in weight which is very impressive.  In addition to this, the housing of the Holosun 403B is made of 606 T6 aluminum, which is a very strong material. One benefit of this material is that it enables the red dot sight to be durable and provide you with long service life.


Without a doubt, Holosun doesn’t compromise when it comes to the performance of their red dot sights and it is no different with the HS403B. This is because this red dot sight is equipped with a lens that comes with 12 different brightness settings.

Therefore, this feature allows you to easily set the brightness levels, which enables you to use the red dot on your most preferred settings at all times. In addition to this, you can also combine this red dot sight with a night vision scope as it is compatible with other attachment devices.

The lens of the HolosunHS403B red dot sight also delivers parallax-free performance throughout. For sure, this is very essential in a red dot sight as it enables you to have an accurate aim of your target every time you use this red dot sight.


Well, red dot sights are not known for aiming targets that are very far away and it is not different from this Holosun HS403B red dot sight. It is equipped with a lens that has a magnification of up to 1x which is pretty good for a red dot sight. This is because it allows you to aim at a target that is up to 100 yards away without any difficulties. However, it is recommended that you add on a scope if you intend to aim at targets that are very far away.

Another feature that makes this red dot sight very useful up to 100 yards is that its lens is multi-coated. This allows it to be dust and water-resistant which allows you to have a clear view every single time you use it. In addition to this, it also comes with unlimited eye relief which means that you can comfortably use it regardless of the distance between your eye and the red dot sight.

Battery life

You’ll agree with me that a red dot sight with a short battery life can be really inconvenient. However, this is not the case with the Holosun HS403B red dot sight as it is equipped with a CR2032 battery that can last you up to 50,000 hours. Well, this is actually a really long time as it is equivalent to 5 years. The major benefit of this is that you will be guaranteed a battery that will serve you for a very long time before you are required to replace it. In addition to this, it will also enable you to save on replacement costs in the long run.

This red dot sight also comes with a ShakeAwake feature which automatically puts it to sleep when it is not in use for some time. For sure, this feature is very useful as it enables the Holosun 403B to save on battery every time it’s on idle. The red dot sight will also automatically go on when you make any slight movement with your gun.

Who is it best suited for?

The Holosun HS403B is a good choice to consider if you own several different guns. This is because it comes with two mounts which makes it compatible with a variety of guns including handguns, rifles, and even shotguns. Therefore, it guarantees you a perfect fit for guns with low mounts and high mounts as well which is pretty convenient.

Are there any alternatives to the Holosun HS403B?

Yes, several red dot sights can serve as great alternatives to the Holosun HS403B. These include the HOLOSUN HS403R Micro Reflex Sight, the HOLOSUN HS503CU, Paralow Red Dot Sight  , and the HOLOSUN HS403C Solar Power Micro Red Dot Sight

Features of the alternative red dot sights

HOLOSUN HS403R Micro Reflex Sight
HOLOSUN HS503CU, Paralow Red Dot Sight
HOLOSUN HS403C Micro Red Dot Sight
2 MOA and 65 MOA circle
2 MOA dot size
Brightness settings
10 daylight settings
Can be used under bright light
10 daytime settings
2 night vision settings
Can be used in low light situations
2 night vision settings
Water-resistance level
50,000 hrs
50,000 hrs
T6061-T6 aluminum housing
High strength aluminum

Final Verdict: So should you get the Holosun HS403B?

Well, this is definitely one of the best red dot sights in the market today because of the convenience it offers you. Aside from being compatible with a variety of guns, this red dot sight also comes with great features that make it stand out from its competitors.


  1. What is the battery type that comes with the Holosun HS403B?

This red dot sight is equipped with a CR2032 battery that can last you up to 50,000 hours before it requires replacement.

  1. What is the specified working temperature of the Holosun HS403B?

Well, this red dot sight operates efficiently between -30°C to 60°C.

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Terrence Miller
Terrence Miller is a hunter by birth, picking it up from a lineage of hunters and will probably hand the skill down to his son. He has been hunting since he was a young boy and has knowledge of both the new and old hunting equipment. This goes to say that the information provided is very reliable and conclusive. Using the hunting rifles and getting the right hunting gear seems to be a challenge for many individuals who want to learn the skill of hunting. And the reason why the information presented by Miller has detailed coverage on the different types of rifles, and rifle scopes. When not in the wild hunting, Miller loves horseback riding.


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