Best Red Dot Sight – Top 10 Pick Reviewed for 2021

Accuracy and precision are two of the things that most shooters look for in a firearm. However, the iron sight of the guns is not that capable of offering those two factors. But do you know which sight can offer those and is ideal for both close to medium ranged targets? Red dot sights!

Nevertheless, if you really want to enjoy all of the things that RDS has to offer, you need to get the best red dot sight. They would be capable of providing a crisp and clear image. Also, they are going to be highly reliable, which is what most of us look for inside a sight.

Our Recommended 10 Best Red Dot Sight Reviews 2021

As you might have guessed, the market is overfilled with options. And it would be quite tricky for you to get the well-performing one among them. To make that easier for you, we have done a tremendous amount of research about the top red dot sights. And these are the ones we can recommend with full confidence:

1. Holosun HS510C Holographic Red Dot Sight

Holosun HS510C Holographic Red Dot Sight

Allow us to start our red dot sight reviews with an offering from a brand that you are most likely familiar with. Yes, we are talking about Holosun. They have been around for a long time and are offering reliable sights in the market. And this one is not an exception in that regard.

So, what makes this RDS reliable? The fact that it can stay on using solar and battery power would be the direct answer. Yes, it would be able to operate even when the battery inside runs out of charge. You can rely on this fully when you are out in a time-consuming operation.

On that note, the unit has the ability to stay on for up to 50 thousand hours. And it can offer that amount of run time with just a single CR2032 battery. For that reason, you will not find it necessary to change or replace the battery that often.

Aside from being highly reliable, the installation process of the unit is quite easy too. Thanks to the QD mounting mechanism, getting it on the firearm and detaching it will be a breeze. There will be no need to go through any intricate processes for mounting and dismounting it.

Lastly, the housing holds the ability to resist shocks. It can also offer a generous field of view.

Highlighted Features

  • Has dual power mode
  • It can run for up to 50000 hours with a single battery
  • Integrates QD mounting mechanism
  • Easy to detach
  • The housing can resist shocks

2. Sig Sauer SOR52001 Red Dot Sight

Sig Sauer SOR52001 Red Dot Sight

Even though Holosun is quite popular, Sig is not that far behind. Most of their RDS are referred to as quality red dot sight. And this RDS that we will take a look at can illustrate that perfectly.

The housing of this magnified red dot has a proper sealing. This sealing makes it highly resistant to water. In fact, it has an official IPX7 rating for water and dust protection. Because of that coating, you would be able to tread on rough and tough environments without worrying that much.

Another thing that makes this the best red dot sight is the capability to resist fog. So, even if you are treading on an environment with varying temperatures, no fog will build up inside. As a result, the images will be consistent in all of the terrains, and there will be a minimal amount of distortion in them,

It even integrates MOTAC. This technology will turn the dot on only when there is movement. In other words, it will make the unit highly efficient. One fully charged battery can offer up to 40000+ hours of run time. That means you will not have to go through the hassle of replacing the battery that often.

Additionally, the product integrates the M1913 interface. The interface will offer a plethora of industry-standard mounting options. Also, it will make the installation process hassle-free.

Highlighted Features

  • The housing has an IPX7 rating
  • Can resist fog from building up inside
  • Packs MOTAC
  • Highly efficient
  • Utilizes M1913 interface

3. Vortex Optics Crossfire Red Dot Sight

Vortex Optics Crossfire Red Dot Sight

You might have already heard about the brand Vortex. They are pretty popular for offering high-quality optics. And the same thing is applicable for this unit, making it the best red dot for ar.

This product is a no-nonsense sight ideal for most of the close and medium-range targets. It is compatible with most AR and rimfire rifles. Additionally, you can use this red dot for shotgun as well. The performance will remain consistently on top of all. There will not be any fluctuations.

Speaking of which, it will not fluctuate that much in terms of battery life either. With a fully charged cell, you can expect this one to run for up to 50000 hours. It even has different settings, of which two are integrated into the unit for dedicated night-vision and 11 for different illuminating features.

Other than that, this best red dot for ar15 can also transmit light exceptionally well. It holds the ability to offer clear and bright images. There is an anti-reflective coating on the lens. This coating will ensure that the reflection is a bare minimum, making it ideal for harsh lighting conditions.

In addition to that, it utilizes tight O-rings to seal the body. For that reason, moisture and small particles will not be able to find their way inside. And it would be capable of offering reliable waterproof performance.

Highlighted Features

  • Compatible with most firearms
  • Has 11 different illumination settings
  • Packs two dedicated night vision settings
  • Can efficiently transmit light
  • Utilizes tight O-rings

4. HOLOSUN – HS403B Micro Red Dot Optic

Micro Red Dot Optic

Another offering from Holosun that has made its position among the best red dot sights is this one. Are you wondering what it has to offer? Well, for that, you need to continue reading!

To start with, it has a compact design. In fact, the product is so compact that you would be capable of getting a low-profile setup on your rifle pretty easily. Also, it is compatible with shotguns as well, which makes it a worthy pick for the best red dot sight for shotgun.

In addition to that, the unit is highly efficient in terms of managing battery life. It utilizes Failsafe technology. That technology allows it to get the most out of a lithium-ion battery. One fully charged cell should last for up to 50000 hours, which is pretty long.

It even boasts the shake awake technology. This technology shuts the power off during inactive moments and turns the LED on only when there is movement. As a result, the battery life will increase even further. Also, you will have plenty of options in terms of the brightness and the mode of the LED.

The product has a proper coating on the lens. This coating will ensure that the light transmission is highly efficient and there is a minimum amount of glare.

Highlighted Features

  • Compact and low-profile
  • Utilizes Failsafe technology
  • Packs Shak Awake technology
  • Efficiently monitors the battery life
  • Minimum glaring

5. Sig Romeo MSR Red Dot Sight

Sig Romeo MSR Red Dot Sight

On the lookout for the best reflex sight for shotgun? Well, you can end your search right here because Sig Romeo might just have the thing that you were looking for!

Let us first talk about the feature that makes it stand out the most; that would be the optics. The lens has a high-performance coating on the exterior. That coating will ensure that the light can efficiently pass through the lens. Also, it is going to make sure that the dot contrast is optimal in all of the situations.

Apart from the lens, the manufacturer did not skimp one bit on the overall build quality as well. They have implemented proper sealing to make the housing achieve an IPX7 rating. For that reason, it should be able to resist water and fog exceptionally well. It does a proper job of fighting dust as well.

Additionally, it is pretty compact in size. The compact nature will supply a tremendous amount of eye relief. It will also make the installation process a bit easier. The weight is pretty low too.

Its battery compartment is in a convenient place. The compartment is on the top side, which will make the battery replacement tasks easy. Also, the run time of the unit is 20000 hours on a CR1632 cell. The run time is pretty high, considering the size of the battery.

Highlighted Features

  • The lens has a high-performance coating
  • It offers a consistent contrast on the red dot
  • Compact and light in weight
  • The battery compartment is on the top
  • Features a proper sealing on the housing

6. Vortex Optics Viper Red Dot Sight

Vortex Optics Viper Red Dot Sight

Another offering from Vortex that you should check out is this one. Its build quality is quite stellar, which is what made us pick it for our reflex sight reviews.

First of all, the construction of the product is of high-quality materials. Such materials make it highly capable of resisting shocks. It also has tight O-rings, which make it resistant to water and small particles. The O-rings will do a proper job in keeping the moisture away from the inside as well.

The overall design of this one is pretty unique too. It has a relatively low height. This particular design allows it to co-witness with the stock iron sight. Also, the 6 MOA dot will offer you the highest level of precision. With that level of precision, landing accurate shots on the target will be an easy task.

Additionally, the hard-anodized finish on the exterior gives it a sleek matte outlook. This looks should blend exceptionally well with most of the handguns and rifles. Also, there are windage and elevation buttons on the side. Those will enable you to tune the dot further.

On that note, it even offers adjustment options regarding the level of illumination and power. You can adjust both of them according to your preference.

Highlighted Features

  • Boasts a stellar build quality
  • Can resist water and dust
  • Has a low height
  • Features a precise 6 MOA dot
  • Sports a hard-anodized finish on the exterior

7. Bushnell Trophy TRS-25 Red Dot Sight Riflescope

Bushnell Trophy TRS-25 Red Dot Sight Riflescope

If you were looking for the best red dot under 100 with a 3 MOA reticle, then you should not look any further because Bushnell is offering what you were exactly looking for all this time!

Like we mentioned, this one features a three MOA dot reticle. The reticle offers a good range of customizability. There are 11 different brightness settings and also some dedicated settings for low-light environments. Also, it mounts easily on firearms with Picatinny rails. 

The overall construction is pretty solid. It has tight O-rings, which does a great job in keeping the water away from the interior. Also, those can keep dust, debris, and other small particles away from the inside. The RDS has the ability to work optimally even when submerged in the water.

On that note, the construction is durable enough to resist shocks. The whole housing is built to withstand harsh and tough conditions. For that reason, you would not have to worry about a thing while carrying out special operations in rugged terrains with this on your rifle.

It features nitrogen purging as well. This purging will make sure that the fog does not build up inside. Also, the exterior has a matte finish, which will make it blend exceptionally well with firearms with and without camos and skins.

Highlighted Features

  • Packs 3 MOA reticle
  • Shut tight with O-rings
  • Resistant to water and dust
  • Shockproof
  • Purged with nitrogen

8. Vortex Optics SPARC Red Dot Sight Gen

Vortex Optics SPARC Red Dot Sight Gen

When it comes to offering high-performance RDS on the market, the brand Vortex has a lot to offer. And this specific model that we are going to talk about is not an exception when it comes to performance.

To start with, it features a rugged overall construction. The construction allows it to withstand harsh environmental conditions without any problems. It will not show any issues, nor will it bizarrely function when you are treading on unfavorable terrain. And, it should last for an extended amount of time because of that construction.

Even though the overall construction is rugged, it is relatively light in weight and compact in size. These two traits will make the installation process an effortless task.

The reticle of the unit is pretty easy to get used to. It utilizes the 2 MOA sight, which is well known for being a point-and-shoot RDS. The reticle holds the ability to let you acquire targets easily. It will also be easier for you to track close to medium targets accurately.

Additionally, the unit is compatible with night-vision. And the dot is tuned to offer optimal performance in all types of settings. Also, the battery life of the device is pretty praiseworthy. It can run for up to 50000 hours on the lowest settings, and on the highest setting, you can expect at least 700 hours.

Highlighted Features

  • Sports a rugged body
  • Lightweight and compact
  • The reticle offers superior performance
  • Night-vision compatible
  • Allows the user to acquire targets quickly

9. Feyachi RDS-22 2MOA Micro Red Dot Sight

Feyachi RDS-22 2MOA Micro Red Dot Sight

Good sights are getting cheap, and cheap sights are getting good. But what do we actually mean by this? Well, to know that, you need to go through this best cheap red dot review.

Even though it is not that pricy, this one does not lack one bit in any of the crucial factors. Firstly, the reticle is highly accurate. It will let you acquire and track targets quickly. And the 2 MOA dot will ensure that you can make rapid engagement with the targets.

Other than the accuracy, it is highly reliable as well. The lenses feature multiple layers of coating. They can efficiently transmit the light through. It also offers a substantial amount of eye relief. And there are 11 different brightness settings, which you can tune to make it work according to your preference.

The unit is pretty light in weight and is relatively compact too. Because of being lightweight and compact at the same time, installing it on the firearms should be an easy task. And it utilizes the five slots 0.83 inches riser mount, which should be compatible with most of the rifles.

It is pretty durable too. The body is of high-quality aluminum. Also, it is shockproof. For that reason, you should get optimal performance for an extended period of time.

Highlighted Features

  • Exceptionally accurate
  • Reasonably reliable
  • It offers a good amount of eye relief
  • Light in weight and compact
  • Sports a shockproof body

10. HS503CU Paralow Solar Micro Red Dot Sight

HS503CU Paralow Solar Micro Red Dot Sight with 1X Magnification

We have got yet another pick from Holosun worthy of being picked as the best red dot scope. Wondering why? Well, you need to go through the review to find out why.

Let us first talk about the overall construction. This one is of T6 aluminum. Even though this makes the unit pretty lightweight, it also makes the RDS exceptionally durable. Also, it has a unique design, which will make it compatible with most of the carbine and rifles.

Other than the design, the run time of the unit is pretty praiseworthy as well. With a CR2032 cell, the device can run for up to 100 thousand hours. That amount of run time is higher than most of the other products that we looked at. So, there will be no need to replace the battery that frequently.

Even the LED can get super bright. The bright nature of the LED will make it easier to track and acquire targets in bright environments. Also, you can tune it down to track targets in low-light environments accurately. The 2 MOA reticle is parallax-free as well. That will enhance the precision even further.

Additionally, it integrates Failsafe technology. That will keep the reticle operational even when the battery fails by using solar power. And it can also automatically adjust the brightness.

Highlighted Features

  • Made of T6 aluminum
  • Can run for up to 100000 hours
  • Sports Failsafe technology
  • Can automatically adjust the brightness
  • Features a unique design

Red Dot Sight Buying Guide

Red Dot Sight

The reviews might have made it easy to choose the best red dot sight, but do you know when it is easier? When you keep some of the important factors in your mind. But what points are we actually talking about? Well, those areas are described below:


Before anything else, you should factor in the size of the sight. Most of the brands will offer the regular version, which would be ideal for rifles and shotguns. However, if you want to attach it with pistols, you would want to opt for the mini versions. Also, to get a low-profile look, get the compact versions.


One thing that will vary from one offering to another is the reticle. Even though all of them will be red dots, the size will not be the same. And the size is generally stated with MOA. Usually, 1-MOA sights are 1.047 inches at 100 yards. Also, the smaller the reticle, the easier it will be to make the bullets land on the target.


Most of the time, the magnification is going to be 1x. However, if you are primarily looking to shoot the medium-range targets, opt for the ones that are 1.5x or higher. Those would enable you to acquire fairly distant targets easily. Also, they will work optimally for the close-range targets as well.

Build Quality

Another thing that will be different for the offerings of different brands is the build quality. It will basically depend on the construction materials. The higher the quality of the construction materials, the better the build quality is going to be. And the ones with a good build quality are going to last for a prolonged amount of time.

Battery Life

Red Dot Sight Battery Life

One of the important things about these is battery life. Almost all of the RDS will rely on coin-style cells. However, the same type of cell will offer different runtime in different units. Usually, the highly efficient ones would be able to offer a longer runtime. And with those, there will be no need to replace the cell frequently.

Failsafe Technology

No matter how long the runtime is, you might end up being in a scenario where the battery will fail. And in those scenarios, the failsafe technology is going to come into play. The units that integrate this would be capable of operating by utilizing the power of the sun.


The lens is the crucial component of sight. And in this case, you should check the quality of the lens. Also, check the coating on the exterior. Make sure that the coating can reduce glaring and reflection. If the coating is high in quality, it would be able to make the light transmit efficiently as well.


Last but not least, consider the adjustability of the RDS. Check whether there are brightness and illumination settings or not. Also, do check if it offers windage and elevation buttons. With these, it would not be possible for you to tune the sight according to your liking.

Red Dot Sight Tips for Beginners: Fear Not the Dot

Frequently Asked Questions

1. Can I change the color of a Red Dot Sight?

Answer: You might not believe it, but some of the units will offer you the ability to change the color of the dot. The dot can be switched to blue or green for some of the modes.

2. What does eye relief mean?

Answer: Eye relief basically refers to the distance between your eyeball and the sight. The higher the eye relief, the lower the distance is going to be.

3. Are all of Red Dot Sights fog proof?

Answer: The fog proofing will depend on the sealing and the gas purging. Usually, the ones that will check both of the factors will be resistant to fogs.

4. Is it possible to change the elevation and windage of a red dot sight?

Answer: Most of the brands will integrate windage and elevation adjustment buttons on sight. However, it will not be common for all of the offerings.

5. What is the average run time of an RDS?

Answer: Usually, these are going to last for about 700 to 800 hours with the brightness all turned up. However, with the lowest settings, the average is generally around 50 thousand hours.

Final Words

Hopefully, after going through the entire article, choosing the best red dot sight is now an easy task for you. However, if we were to recommend one, we would select the Holosun HS510C for the dual power mode. The Sig Sauer SOR52001 is a great pick as well.

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