Your Ultimate 300 Blackout Red Dot Guide!

Our Top Picks

Best Overall

Holosun HS510C

Holosun HS510C
  • Reticle: 9/10
  • Battery Life: 9/10
  • Cost: 9/10

User-friendly red dot with long battery life.

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Best Value

Vortex Optics Strikefire II

Vortex Optics Strikefire II
  • Reticle: 8/10
  • Battery Life: 9/10
  • Cost: 10/10

Offers a good balance of clarity and reliability.

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Best Heavy Duty

Trijicon ACOG

Trijicon ACOG
  • Reticle: 9/10
  • Battery Life: 10/10
  • Cost: 7/10

Today, we’ve got an exciting agenda lined up, we’re on a mission to discover and review the best red dot sights for your trusty 300 Blackout rifle. From the most reliable to the most budget-friendly, we’ll cover it all. So, if you’re ready to discover our top 300 Blackout red dot pick, let’s get started!

300 Blackout Red Dot: What Is It Good For?

complete psa 300 blackout pistol
300 blackout red dot

Mounting a red dot sight on a 300 Blackout rifle comes with several significant benefits. For one, it greatly enhances your target acquisition speed, allowing you to spot and aim at your targets faster and more efficiently. The simplicity of a red dot also helps to eliminate the need for aligning front and rear sights, thereby simplifying the shooting process and reducing the chance of errors. Plus, red dot sights are known for their accuracy, ensuring that you can make your shot count even in low-light conditions. Additionally, they’re typically more durable and lightweight compared to traditional scopes, making your 300 Blackout rifle easier to handle during extended use.

How to Choose the Best 300 Blackout Red Dot

Instead of using a string of fancy adjectives to describe each product, we want you to have a concrete basis when choosing your 300 Blackout red dot. That’s where our efficient scoring system comes in.

FeaturesHolosun HS510CVortex Optics Strikefire IITrijicon ACOGSig Sauer Romeo5EOTECH EXPS2 Holographic Weapon SightCategory Average
Overall Score4.083.553.984.123.233.79
Build Quality4453.54.54.2
Battery Life54.54.551.54.1

Picking the right 300 Blackout red dot ain’t like choosing between vanilla and chocolate ice cream. Here’s what you need to check off your list:


Excellent optics allow you to see your target clearly, no matter if you’re aiming under the bright sun or in low light. You want a red dot that brings your target into sharp relief, with colors that pop and details that stand out, making it easier to hit your mark every time.

Lens Clarity

looking through Trijicon ACOG

When you’re peering through that sight, you want to see your target in high-definition clarity (or at least something close). So, opt for a red dot sight that offers bright, clear, and unobstructed views. Look out for any signs of blurring, distortion, or color aberration in the lens. A good red dot will provide a sharp and clear reticle without any ‘starburst’ effects, even at maximum brightness settings.


Your red dot sight needs to be precise. The dot should be crisp and well-defined, not a blurry mess that makes precise aiming a challenge. It’s also important that the sight holds zero, meaning that once you’ve set the alignment of the sight, it should stay there without drifting off.

How do we rate it?

We rate the clarity, brightness, dot crispness, and field of view on a scale from 1 to 5. A higher score means the optics provide crystal-clear images under various lighting conditions, have minimal distortion, and offer a wide field of view.


The amount of illumination needed depends on the environment: lower settings for dim conditions to avoid overpowering glare and higher settings for bright daylight to ensure the reticle is visible against the light. Ideally, a red dot should offer a range of settings to accommodate everything from the darkest nights to the brightest days.

How do we rate it?

We evaluate the brightness levels, daylight visibility, and reticle clarity. A score of 5 means excellent visibility in both bright sunlight and low light conditions, and a reticle that remains sharp and defined.

Build Quality

Sig Romeo5 mounted

The best red dots are the ones that can take a beating and are still raring to go. A red dot sight is an investment, and you want it to last. It should be tough enough to handle rough use and resistant to water, fog, and shock. A good pick would be one made from durable materials like aircraft-grade aluminum.


Aside from its robust build, you need a red dot sight that you can trust. You want something that won’t bail on you when you need it the most. A red dot that gives up at the first sign of a cloudy day? Uh-uh, no thank you.

You’re going to want a sight that performs consistently, regardless of the weather or lighting conditions. This means it should power on when you need it, hold zero despite recoil or bumps, and the illumination shouldn’t flicker or fade over time.

300 BLK Compatibility and Mounting Options

Not every red dot sight plays well with every rifle. Ensure that the sight is compatible with your 300 Blackout rifle and can be mounted without any major hassles. You don’t want an arm wrestling match every time you mount or dismount it. A sight that comes with an adjustable or versatile mount would also be a bonus.

How do we rate it?

We assess the durability, material quality, and weather resistance. A higher score indicates a red dot that feels solid, is made from high-grade materials, and can confidently withstand harsh conditions and rough handling.


A sight that runs out of juice when you need it most can be a real pain. Check out the expected battery life, and consider sights with an auto-shutoff feature to conserve power when not in use. And remember, having to constantly replace batteries can be an annoying (and costly) hassle. 

How do we rate it?

We consider how long the battery lasts under typical use. A score of 5 means that the red dot offers an exceptionally long battery life. We also consider if the compartment offers convenient battery changes and if the battery is easily available on the market.


A well-designed red dot should allow for quick, intuitive adjustments and a comfortable, secure grip. This allows you to maintain concentration and accuracy.

How do we rate it?

This involves the design’s comfort, ease of use, and adjustability. In this aspect, a higher score means the red dot is comfortable to use for extended periods, controls are intuitively placed, and adjustments can be made easily and accurately.


A red dot that’s easy on the wallet but skimps on important stuff like clarity or durability? That’s a no-go. But one that’s priced a bit higher yet packs in all the features you need—crisp optics, solid build, long battery life, and user-friendly design—that’s hitting the jackpot. We want you to score a reliable, high-performing red dot without blowing your budget.

How do we rate it?

We assess the overall worth, taking into account the price compared to the features and performance offered. A higher score indicates a red dot that offers an excellent balance of quality features at a price that represents good value for money.

5 Best 300 Blackout Red Dots

Best Overall: Holosun HS510C

Holosun HS510C Multi-Reticle Circle Dot Open Reflex Sight w/Solar...
Holosun HS510C Multi-Reticle Circle Dot Open Reflex Sight w/Solar...
  • HOLOSUN RED DOT SIGHT - The HS510C sight is a versatile open reflex optic designed for long gun applications; It is at home on carbines, PCCs, and shotguns due to its durable design; This gun sight...
  • MULTI-RETICLE SYSTEM - This Holosun red dot sight is equipped with MRS to let you select a fast sight picture for shorter distances with a 65 MOA circle with 2 MOA dot; The large circle allows for a...
  • SHAKE AWAKE TECHNOLOGY - Extends battery life by deactivating the optic's LED while not in use; Shake Awake offers settings from 10 minutes to 12 hours depending on the model and can be deactivated...

FactorHolosun HS510CCategory Average
Build Quality44.2

Quick Specs:

  • Reticle: 2 MOA Dot & 65 MOA Circle
  • Weight: 4.94 oz
  • Length: 3.3 in
  • Battery life: 50,000 hrs

The Holosun 510C is a reflex sight with a user-friendly reticle that’s common in holographic sights. We love the 510C’s Advanced Super Solar Technology. This feature serves as a backup for when its battery runs out of power, not that 50,000 hours of battery life isn’t enough, though.

The Holosun 510C allows the user to switch between three reticle patterns with a quick push of a button. You can choose between a 65 MOA circle with 2 MOA dots, a 2 MOA dot, or a 65 MOA ring. It also features multi-coated optics that are specially designed for rifles. It’s also equipped with a shock-resistant hood for protection against debris or any external impacts.


  • Unlimited field of view
  • Comes with Shake Awake feature
  • Reasonable price
  • 50,000 hours battery life


  • Mounting lock lever springs are a little flimsy

What Customers Say

Came with an extra battery holder, tools and three batteries. Put it on in two seconds flat. Super simple controls and adjustments. I flipped up my iron sights and with a few clicks with the included tool I set the co-witness reticle to the front site before even going out. Dead on first shot. 800 rounds later and still on target. Very impressed with the shake-awake feature and the auto brightness function. Only downfall with the auto brightness function is if you are in the shade and the target is in bright sun, the recticle dims to where you are. (under a roof at the open range.) Just switch to manual and you will be fine. Overall I give it 9.5 out of 10. I am going to get a HOLOSUN for my 45 pistol next.

Paul H.

Best Value: Vortex Optics Strikefire II

Vortex Optics Strikefire II Red Dot Sight - 4 MOA Red/Green Dot with...
Vortex Optics Strikefire II Red Dot Sight - 4 MOA Red/Green Dot with...
  • The Strikefire II Red/Green Dot is a rugged, reliable red dot sight that is at home in a variety of shooting applications. It allows the shooter to operate between two dot colors and ten brightness...
  • Fully multi-coated lenses provide a clean and bright, unobscured point of view. Unlimited eye relief allows for rapid target acquisition.
  • The single-piece chasis is compact and lightweight but still delivers shockproof performance withstanding both recoil and impact. Nitrogen purging and o-ring seals ensure fogproof and waterproof...

FactorVortex Optics Strikefire IICategory Average
Build Quality44.2

Quick Specs:

  • Reticle: 4 MOA
  • Weight: 7.2 oz
  • Length: 5.6 in
  • Battery life: 80,000 hrs (lowest setting)

Now, this one’s for those who like getting more bang for their buck. The Strikefire II offers a good balance of clarity and reliability, and it’s quite easy on the pocket. The feature to note here is its unlimited eye relief, which allows flexible mounting options. It comes with 10 intensity levels that you can easily adjust through its user-friendly knobs. Not to mention our favorite feat, as it automatically returns to the last dot intensity used upon turning it on.

It’s a tad on the heavier side though, so if you’re all about lightweight optics, this might be a point to ponder.


  • Affordable
  • Waterproof and fog proof
  • Comes with Vortex warranty
  • Audible windage and elevation clicks
  • Long battery life


  • Heavy

What Customers Say

This optic installed quickly and easily. It was a breeze to get sighted in and was spot-on for all the 100 meter targets I was engaging. Vortex has a good reputation and it is not unfounded. This is a very good optic for the price.


Very well built. Accurate for fast, solid C-zone hits out to 100 yds. I compete with this optic regularly, and it absolutely keeps up with the more expensive red dots out there.

Eric D.

Best Heavy Duty: Trijicon ACOG

Trijicon Trijicon ACOG 4 X 32 Scope Dual Illuminated Crosshair .223...
Trijicon Trijicon ACOG 4 X 32 Scope Dual Illuminated Crosshair .223...
  • BATTERY-FREE ILLUMINATION: Features a tritium/fiber optic illuminated reticle that automatically adjusts the brightness based on available light
  • RUGGED ALUMINUM-ALLOY HOUSING: Forged 7075-T6 aircraft-aluminum-alloy housing provides for a nearly indestructible sighting system
  • ?BOTH EYES OPEN? DESIGN: The ACOG can be used as a CQB sight when shooting ?both eyes open,? utilizing the Bindon Aiming Concept

FactorTrijicon ACOGCategory Average
Build Quality54.2

Quick Specs:

  • Weight: 15.1 oz
  • Length: 5.9 in
  • Battery life: 12,000 hrs

The Trijicon ACOG is a no-nonsense, robust optic packed with state-of-the-art features like battery-free operation and a dual-illuminated reticle. The field of view seems huge when you look through it, and even though it isn’t a true 1x, it’s still pretty quick for target acquisition. With the Trijicon ACOG’s fixed zoom, there are no adjustment mechanisms to break, and as a result, the ACOG is legendary for its durability. It’s built like a tank, so it laughs in the face of rugged use. Although, with that hefty price tag, your wallet might not be laughing.

Trijicon Acog 4×32 Review


  • Battery-free illumination
  • Always illuminated reticle
  • Built like a tank
  • Lifetime warranty


  • Expensive
  • Not as versatile as some other red dot sights
  • Heaviest among our picks

What Customers Say

Easy to mount. Easy to sight in. Easy to shoot. Tough as nails.

Harry B. Wease

I bought this scope a few years ago. Still mounted to my rifle, the glass is still really clear it holds up really well to the saltwater environment and harsh winter in my home town. Holds zero dropped it a few times oops but never questioned it. Well worth it.


Sig Sauer Romeo5

SIG SAUER ROMEO5 1X20mm Tactical Hunting Shooting Durable Waterproof...
SIG SAUER ROMEO5 1X20mm Tactical Hunting Shooting Durable Waterproof...
  • ROMEO5 GUN SIGHT - The ROMEO5 1X20mm Red Dot Sight mounts on any platform, and even though it's small, it's tough; The solid, lightweight aluminum design gives peak performance & years of service, so...
  • 2 MOA RED-DOT - For those avid shooters who admire classic red dot reticles on their gun sights, the ROMEO5 has 2-MOA Red-Dot, which is also adjustable; It provides 10 illumination settings (8...
  • MOTAC TECH - The versatile ROMEO5 red dot sight features our Motion Activated Illumination technology; It is developed to increase battery life by shutting down the system when not in use and...

FactorSig Sauer Romeo5Category Average
Build Quality3.54.2

Who said you can’t find a decent and reliable red dot for a hundred bucks? Well, the Sig Sauer Romeo5 proves them wrong.

This compact red dot sight features a 2-MOA reticle with 10 illumination settings, giving you flexibility while shooting in any lighting condition. What made us pick the Romeo5 is its Motion Activated Illumination that shuts down when the sight is not in use. This extends your optic’s battery life up to 40,000 hours!

Sig Romeo5 Red Dot Sight Hands-on Review

Quick Specs:

  • Reticle: 2 MOA
  • Weight: 5.1 oz
  • Length: 2.5 in
  • Battery life: 40,000 hrs


  • Quick battery replacement
  • Affordable
  • Comes with an M1913 Picatinny low mount riser
  • Motion-activated, great for home defense
  • 40,000 hours battery life


  • It has a slight parallax
  • The outer lens is reflective when viewed from a certain angle

What Customers Say

Absolutely love this thing! Mounted on my Marlin 1895gs chambered in 45-70 govt with an American Defense T1 quick-release mount. Holds up to the recoil and honestly, I couldn’t have picked a better optic and mount. The setup was zeroed in 4 rounds and after that, I felt like I couldn’t miss! I keyholed rounds between 50 and 100 yards all day. This sight didn’t miss a beat and I will be buying more. I love Sig optics and they have yet to let me down and this one is worth every penny!!!


Being right-handed with a dominant left eye, it is now possible to shoot with both eyes open and no problems as far as sighting or shooting! This is the best thing for me personally that I’ve come across.

61 Blacklowrider

EOTECH EXPS2 Holographic Weapon Sight

EOTECH EXPS2 Holographic Weapon Sight
EOTECH EXPS2 Holographic Weapon Sight
  • EOTECH EXPS2 Holographic Weapon Sight
  • Side Button Operation - Compact design and side button operation consumes minimal rail space and is ideal for use with a G33 Magnifier
  • Mount - Quick Detach lever fits 1" Weaver and MIL-STD 1913 Rails

FactorEOTECH EXPS2 Holographic Weapon SightCategory Average
Build Quality4.54.2

Quick Specs:

  • Reticle: 1 MOA
  • Weight: 11.2 oz
  • Length: 3.8 in
  • Battery life: 1,000 hrs

If close-quarters combat is your game, the EOTECH EXPS2 is your name. With its large viewing window and holographic reticle, target acquisition is faster than ever. This optic is proven to function even after its glass is tainted or covered with mud or snow. The EXPS2 Holographic Sight features 20 manually adjustable brightness settings for all types of lighting. It features a quick-detach lever (that we love) which is great for when you want to switch this sight back & forth between rifles.

It’s also equipped with an auto-shutdown feature that’s user-programmable for up to 8 hours. This allowed us to save battery for when it’s time for action!


  • Comes with a 10-year warranty
  • Comes with an auto-shutdown feature
  • Unlimited eye relief
  • Side button operation


  • Expensive
  • Only 1,000 hours battery life (continuous at nominal setting)
  • Heavy

What Customers Say

I love this sight! My AR-15 is so fun to shoot with this Eotech. It was easy to sight in and it is really accurate! I love the quick detach mount. you can take it on or off in a second and it won’t lose its Zero! It is a lot of money to pay for sight but worth every penny! You want the best you got to dig a little deeper into your pocketbook! I give it a FIVE STAR!

Rick Wear

I am cross-eye-dominant. That means that while my left eye is dominant, I am right-handed. That causes all kinds of aiming problems that I find difficult to overcome (I find it difficult to close my left eye while keeping my right eye fully open). With the EOTech sights, I can keep both eyes open and I have no cross-eye-related sight picture shift.


Bottomline: 300 Blackout Red Dot

There you have it, the highlights and the lowlights of our top picks! Remember, every sight has its strengths and weaknesses, but as long as you pay attention to the factors we listed above, you’ll have a much better chance of picking a red dot sight for your 300 Blackout that you’ll be happy with. So, keep these points in mind and make an informed decision that best suits your needs and preferences.

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Last update on 2024-06-07 / Images from Amazon Product API