Best Red Dot Sight For 300 Blackout Pistol

Hey there! Are you looking for a red dot to fit your 300 Blackout pistol? I have got you covered. 

If you are wondering why you should trust my opinion, I have put all my experience and one week of research into curating this best red dot sight list. I also take guidance from my war veteran friend Mitchel. 

Our main points of concern in the review below are durability, battery life, price, and reticle options. 

In my view, the best option here is the Holosun 510C. However, if you disagree with me, there are other options. 

So, let’s get right into it.                                 

My Top Picks 

If you are in a hurry and don’t have the time to read the whole review, I have mentioned below my top picks and what they offer you. 

1. Holosun 510C: The best overall

2. Trijicon MRO: The Trijicon level durability

3. Sig Sauer ROMEO 5: The best affordable option 

Top 5 Best Red Dot For 300 Blackout

Below is the list of 5 best red dots for your 300 Blackout.

Key Features
Holosun 510C
A budget optic with good built.
Incredibly clear dot
Innovative battery-related features
Multiple reticle options
Trijicon MRO
Wide lens
Multi-coated glass
Many mounting options
Easy to use control system
Sig Sauer ROMEO 5 
Well-built and durable
Incredible battery life
Aimpoint Pro
30,000 battery hours
Bushnell Trophy TRS-25
Budget option

1. Holosun 510C – The Best Overall

Holosun 510C
Holosun 510C (Image credit: Amazon)

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Brand: Holosun | Weight: 4.94 oz | Material: Aluminum & Titanium Hood| Length: 3.3 inches | Width: 1.68 inches | Height: 1.78 inches

What’s Special?

  • A budget optic but not built like one.
  • Clear dot
  • Innovative battery-related features 
  • Multiple reticle options

The Holosun 510 C is a tough competition to all the top-notch brands; it has everything you need in a good red dot sight.

 This optic gives a clear and crisp dot which makes target acquisition better. It is perfect for people with astigmatism. 

The reticle options on this sight make it better than most competitors. They include a dot, circle, and combination of both. The circle gives faster target acquisition, and the only dot option gives accuracy. 

This reflex sight has 50,0000 hours of run time which comes with several innovative battery-related features. These features make the Holosun stand out. First is the ”Shake Awake” which protects the battery by automatically turning it off when there is no movement for 10 minutes and instantly turning it back on as soon as it senses any movement. Also, with the size battery compartment, you can change the battery of your optic mounted on the firearm without losing zero.

My Experience

The Holosun 510C is the red dot sight on my 300 Blackout pistol. I recommend it to my other shooter friends. But, what I love most about it is its crisp and clear dot. 

What More Does It Offer?

  • Both green and red dot: This sight includes red and green dots. It’s always better when there are two color options in a reticle because some people pick up the red color better, and others pick up the green better. 
  • Solid build: This sight has a solid build with grade 5 titanium housing. It is waterproof up to 1 meter for 30 minutes. 
  • The solar fail-safe: If your battery dies, you can go to the backup solar power–with this innovative feature, Holosun has outwitted Trijicon
  • 12 brightness settings: It has 10 brightness settings for daytime and 2 for night vision. It makes the dot night vision compatible. 
  • You get a precise zero: 0.5 MOA adjustment gives an accurate zero. 

What’s Lacking?

  • Not made in the US: This optic doesn’t get made in the US, which could be a problem for people who like to buy only US-made optics. 
  • The solar panel needs improvement: The solar panel in this reflex sight is not as good as other Holosun red dots. It is dim and directional. 

Holosun gives you a complete package with multiple reticle options, good quality build, and excellent battery life. If you want a fast, clear, and reliable red dot optic for your 300 Blackout for hitting close-range targets, get a Holosun 510C. Also, you don’t need to spend too much money. 

2. Trijicon MRO – The Durable Option

Trijicon MRO
Trijicon MRO (Image credit: Amazon)

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Brand: Trijicon | Weight: 4.1 oz | Material: 7075-T6 forged Aluminum | Length: 2.6 inches | Width: 1.7 inches | Height: 2 inches

What’s Special?

  • Durable
  • Wide lens gives 
  • 5 years of battery life

Trijicon optics are known for their durability and rugged build in the weapons community. For example, the Advanced Combat Optical Gunsight and Variable Combat Optical Gunsight are the two tactical scope options by Trijicon. 

Trijicon has done several things to make the MRO a durable optic:

  • First, it includes fully multi-coated lenses to increase light transmission.
  • The optic’s body is 7075 T6 Aluminum with a rubberized hard coating and a hard-anodized finish. So, we know that this product is durable.
  • It is water submersible up to 30 meters. So, yes, you can go scuba diving with this optic. 

The other fantastic feature about this optic is that it has a twenty-five-millimeters wide lens with a tapered fit that comes out and opens up your eye. Usually, microdots have a tube-like lens. It feels like you are looking through a tube. The MRO is different from the standard microdot because it’s tapered, so you get a bigger objective lens. When you look through a standard microdot, it’s more like you are looking through a tube. With the nice wide objective, you can see the dot well. The lens is also angled and helps to keep the reflection down. 

Moreover, it also has 5 years of battery if you keep it at setting 3. 

My Experience

The Trijicon MRO is a part of my Trijicon sights’ collection. All I can say about this optic is that it is durable and performs well. 

What More Does It Offer?

  • Many mounting solutions: This optic comes in various mounting solutions, from a super low profile mount to a taller ⅓ co-witness type mount.  
  • Recessed elevation and windage adjustments: Trijicon has recessed the windage and elevation adjustments inside the optic, so they will not get bumped. Another feature is that the elevation and windage adjustments are exposed, so you don’t worry about the caps. 
  • Features a 2 moa dot: The 2moa dot gives a small and crisp dot for engaging long-range targets. It is large enough to pick up quick and small enough if you want to go for precise firing. 
  • Fine brightness settings: The brightness settings are very fine. You see a significant difference when you change the setting but will not feel that it’s dim or too bright. 
  • Easily accessible adjustment knob: The brightness adjustment knob is huge and right in the center of the top plane of the optic. It is great because this knob is what you will be manipulating the most, so placing it there makes it easy to grab. 

What’s Lacking?

  • Sightly bluish tint: Some shooters might have a problem with this optic having a slightly bluish tint. But the tint doesn’t affect to discern what color something is. 

So, if you want a durable red dot with a wide lens and extended battery life, get a Trijicon MRO. 

3. Sig Sauer ROMEO 5 – Best For The Price

Sig Sauer ROMEO 5
Sig Sauer ROMEO 5 (Image credit: Amazon)

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Brand: Sig Sauer | Weight: 5.1 oz | Material: N/A| Length: 2.46 | Width: 1.5 inches | Height: 1.51

What’s Special?

  • It is a well-built and durable option
  • The best option for the price
  • Incredible battery life

All the models of the Romeo series are awesome. They have specific features that define them. The best part of the Romeo 5 is the price. Another cool thing about this red dot sight is the Motion Activated Illumination. The MOTAC feature turns off the sight automatically if the sight is still for a minute. It turns on again as soon as it detects any motion. This feature helps to give this optic and extended battery for 40,000 hours, which is the Aimpoint and Trijicon level of battery life. It is always good when you can pick up your gun and start shooting without being worried about the battery. 

The Romeo 5 is durable. It has a clear lens and a good quality tube which is anodized and resistant to damage. I have explained in the testing section the durability of this optic. 

My Testing

I have been using my Romeo 5 for 10 months, and so far, I have not had any issue with it. For my testing, I submerged this optic in a cup of water for an hour, there was no fogging or sweating, and the dot worked fine. I also did the freezing test on this optic by keeping it in the freezer overnight in a cup of water, and when I shot with it in the morning, it still held zero. Next, I threw my Romeo 5 up for 10-15 feet and let it hit the ground for the impact test. Again, it not just held all abuse but also held zero. I was amazed to see these results for a budget-friendly sight.

What More Does It Offer?

  • Reliable MOTAC feature: The motion activation feature is fast and dependable. 
  • Crisp dot: The dot is crisp. It is essential for people with astigmatism. 
  • 10 illumination settings: It has 10 brightness settings with 2 settings for night vision compatibility. 
  • Quick and easy to zero: You can use the caps on the windage and elevation turret to quickly and easily zero your optic. 
  • Includes two mounts: This optic has two mounting options; a high mount and a low mount. 
  • Works in all weather conditions: This option is suitable to work in the summer heat, the rain, and freezing temperatures. 

What’s Lacking?

  • Not made in the US: This optic is not US-made. So, it can be a con for someone who prefers US-made products. 

If you want a solid design packed with amazing features at an affordable price, get a Romeo 5. It’s hard to find a better red dot optic than the Romeo 5 at the same price. 

4. Aimpoint Pro – The Combat Proven Optic 

Aimpoint Pro
Aimpoint Pro (Image credit: Amazon)

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Brand: Aimpoint | Weight: 7.8 oz | Material: Aluminium| Length: 4.8 inches | Width: 1.9 inches | Height: 1.9 inches 

What’s Special?

  • Combat-proven
  • Aimpoint quality without breaking the bank. 
  • 30,000 hours of battery life. 

The Aimpoint Pro is a combat-proven, reliable optic. The military and law enforcement all over the world use this optic. Putting this on your gun gives you the confidence that it will defend your life or home. 

This optic is mil-spec, type-3 hard anodized coated. It has flip-up spring-loaded caps for the protection of the lens.  Also, it has the clearest glass you can find in a red dot. 

Moreover, it gives 30,000 hours of incredible battery life. So you know that it will always be on and ready to use when you need it. 

Lastly, it comes with a QRP2 mount, which is toolless. It has a knob on the side for easy, tool-less mounting. 

If you want an optic with Aimpoint toughness and quality in less than 500 dollars, get an Aimpoint PRO. 

5. Bushnell Trophy TRS-25 Red Dot – The Budget Optic

Bushnell Trophy TRS-25
Bushnell Trophy TRS-25 (Image credit: Amazon)

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Brand: Bushnell | Weight: 4 oz | Material: Metal | Length: 2.5 inches | Width: 3.4 inches | Height: 2.2 inches 

What’s Special?

  • The below 100 dollar option
  • Waterproof, fog proof, shockproof
  • Lightweight

If you want to buy an optic but cannot afford to spend a lot of dollars on it, the Bushnell Trophy TRS-25 red dot is your optic. 

It is a lightweight optic at just 4 ounces. So you don’t have to add too much weight to your 300 Blackout. Moreover, it is waterproof, shockproof, and fog proof. 

Lastly, it gives you 5000 hours of battery at mid-setting and 11 brightness settings. 

So, get a good quality optic without spending too much money. 

Competitors That Are Worth A Try

1. Vortex Optics Crossfire Red Dot Sight Gen II 

2. Sightmark Ultra Shot M-Spec Reflex Sight

3. Truglo TruBrite Multi-Reticle Dual-Color Open Dot Sight

4. Bushnell Optics TRS-25 Hirise

Factors To Consider Before Buying A Red Dot For Your 300 Blackout


Durability is an important factor while choosing your red dot optic. The durable options in my list are the Trijicon MRO, SIG Sauer ROMEO 5, and the combat-proven Aimpoint Pro. 

Battery Life and Protection

For some shooters, battery life can be the only important consideration. Some optics have an extended battery life, and some have added features like shake awake that protect the battery. 

But good hours of battery life are important because you want your optic to be on when you need it. For example, the HoloSun has 50,000 hours of battery life and the ”Shake Awake” feature that protects it. 

Reticle Settings 

A good reticle has multiple settings and brightness options. For example, the Holosun 510C has multiple reticle options with a dot, a circle, and a circle-dot combination. 


For some people, price is the only factor that matters. The Sig Sauer Romeo 5 and the Bushnell Trophy TRS-25 are the two options that give you good performance without spending too much money. 


What is a 300 Blackout pistol good for?

A 300 Blackout pistol is good for home defense or fun shooting at the range. You can make it even better by adding the right optic with it.

What is the best red dot sight for a 300 Blackout? 

Following is the list of the best red dot for a 300 Blackout:

1. Holosun 510C

2. Trijicon MRO

3. Sig Sauer ROMEO 5 

4. Aimpoint Pro

5. Bushnell Trophy TRS-25

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