Top 5 Best Red Dots for a 300 Blackout Pistol • (2023 Guide)

Did you land here today to find the best red dot for a 300 blackout pistol? We sure hope so because this guide is all about getting you the best optic for your new blackout. We put our expertise to work – including our brains – to narrow down our favorite sights to the absolute best of the best. So, if one thing is for sure, you won’t find any leftovers here.

Since the blackout pistol is a perfect firearm for home defense or a fun day at the range, the reflex sight is the preferred choice. With a reflex sight, you have the ability to rapidly acquire your target with both eyes open. As a result, it’s much easier to hit your target to successfully protect yourself and your family.

Additionally, we chose sights that are compatible with the most popular 300 blackout models. You’ll find options for Sig, Springfield, Wilson, and Ruger, including one of our favorites, the ultra-compact MCX Rattler. Plus, if you suffer from astigmatism, our #1 pick is an excellent choice for everyone.

Now, without further ado, it’s time to share our picks…

Best 300 Blackout Pistol Red Dot Reviews

Each of our reviews includes all the information you need to choose which sight suits your taste and needs. You’ll discover pros & cons, key features, and the benefits of ownership.

#1) Holosun HS510C

Overall, the Holosun HS510C gives you the most value for your money. Comparatively, this open reflex optical sight costs less than some of the “premium” models, yet it functions on a premium level. First, the feature we really like is the crisp circle dot reticle that’s very easy to see. This feature alone makes target acquisition easy-peasy, and that’s what it’s all about when using an AR pistol for home defense.

Next, you never have to worry about battery power with the HS510C because it’s solar and sports a 50,000-hour battery life on a single CR2032 battery. Third, the Shake Awake feature is one of the most unique & worthwhile features offered by an optic. When you’re ready to go, there’s no need to press any buttons or rely on motion detection tech. Instead, the Holoson instantly wakes up with a simple shake.

Several final highlights are the durable aluminum & titanium construction, a large viewing window for enhanced FOV, 12 brightness settings with 2 night vision modes, and finally, the quick-release mount makes installation a breeze. All in all, this is a budget version of a Trijicon RMR sight that’s not built like a budget model at all. It’ll be interesting to see how long the price remains this good or if this sight manages to drag competitors’ prices down.


  • Impressively clear glass with a large viewing window
  • The circle dot reticle is perfect for folks with poor vision or eyesight issues
  • The Shake Awake feature is reliable
  • IP67 waterproof rating
  • Solar power to rely on in case the battery dies in the field
  • 50,000-hour battery life
  • 12 total brightness settings with night vision options
  • Quick-release mount for easy installation
  • No parallax issues
  • Limited lifetime warranty


  • Heavier than other reflex sights at 4.94 oz
  • Auto brightness may need some improvement in changing light conditions
  • Not quite as durable as top-end models

#2) Trijicon MRO 1×25 Red Dot Sight

Trijicon 2.0 MOA Adjustable Green Dot Sight w/Lower 1/3 Co-Witness Mount, Black, MRO-C-2200031

Coming in at #2 on our list is a red dot that could easily be #1 on a lot of lists. Trijicon took the MRO to the next level by increasing the viewing area by 5mm and putting the brightness controls on the top. Now, you’re able to use this optic as a reflex-style sight for lightning-fast target acquisition without sacrificing your peripheral vision. Additionally, the on-top ambidextrous brightness control means both right-handed and left-handed operators can keep a finger on the trigger.

Next, the MRO brings crystal-clear optics to the table that Trijicon is well-known for. Considering this model is a 2.0 MOA dot, it’s a pleasure to know that your dot is as crisp as they come in all lighting conditions. Third, battery life is one area where Trijicon is the clear leader. Despite not having solar, this sight doesn’t need it with up to 5 years of continuous use on a single battery on settings 5 through 8.

Lastly, it’s important to consider just how durable the MRO red dot is. The fully-sealed design built with 7075 forged aluminum is one of the reasons Trijicon backs the MRO with its lifetime warranty. Plus, the MRO is one of the leaders in the waterproof category with a submersion depth rating of 100 ft. All things considered, the MRO is a top-shelf optic that’s built for savvy 300 blackout pistol owners who want the best.


  • Crystal-clear glass
  • Larger 25mm viewing area
  • Ambidexturous single-handed brightness control
  • Waterproof down to 100ft
  • Up to 5 years of continuous use on a single battery
  • Durable 7075 aluminium construction
  • Lightweight at 4.1 oz
  • Limited lifetime warranty
  • Made in the USA


  • You might find that it’s harder to use with both eyes open than other models
  • Higher price
  • Lens cap not included

#3) SIG SAUER ROMEO3 1×25 mm Open-Reflex Sight

If you own a Sig MCX Rattler, the ROMEO3 pairs nicely with it. Also, you’ll find that the ROMEO3 is an overall great red dot that pairs well with other 300 blackout pistols. Compared to the ROMEO5, the ROMEO3 is somewhat lesser-known, but we feel that it brings some solid features to the table that are worthy of your consideration.

Currently, there are three ROMEO3 models available with the standard 25mm, ROMEO3MAX 30mm, and the ROMEO3XL 35mm. So, if you want an extra-large viewing area, those latter two options are worth a look. First, one feature that sets this optic apart is Sig’s Motac tech that uses a motion sensor to automatically turn on the sight. You might prefer this tech over the Shake Awake tech on the Holosun.

Second, the ROMEO3 is mighty compact, weighing just 1.4 oz, making it ideal for co-witness or low mounting methods. Regarding construction, Sig didn’t skimp when it chose to build this optic with aircraft-grade CNC aluminum. Plus, the ROMEO3 is IPX-7 waterproof rated for safe submersion up to roughly 3 ft.

Check out the MCX Rattler with the ROMEO3 in action below:


  • Sig’s clear SpectraCoat glass
  • Mutliple viewing area sizes available up to 35mm
  • Motion-detection tech to conserve battery
  • IPX-7 waterproof rating
  • Aircraft-grade aluminum housing
  • Lightweight and compact at 1.4 oz
  • Includes M1913 Picatinny low-rise mount & quick-release QD1.41″ co-witness riser mount
  • Side-loading battery
  • 5-year warranty


  • Glass is more prone to breaking than other models
  • You might find the reticle to be too bright
  • Sig should improve on its mounting options

#4) Aimpoint PRO Patrol Rifle Optic

Uh-oh, are we confusing you? It’s hard to go wrong with any of the sights in our guide, and the Aimpoint Pro is another top-of-the-line red dot for a 300 blackout pistol. If you’re a fan of Trijicon’s MRO, then Aimpoint’s Pro is worth a look before making your final decision. Firstly, you get flip-up lens covers rather than having to buy them separately. Plus, the rear lens cover is transparent for more speed during emergency situations.

Secondly, the battery life of the Acupoint PRO is reliably measured in years. According to Aimpoint, the PRO can run up to 3 years continuously, and that number holds true in the field. In our humble opinion, this is even better than relying on motion detection or shake awake features.

Beyond battery life, the Aimpoint PRO is built like a tank with a hard-anodized, high-strength aluminum housing and tough-as-nails glass. Next, the fact that it’s waterproof down to 150 feet is one of the most impressive numbers on the market. A couple of final highlights are the large viewing area for operation with both eyes open and the ease of sighting it in right out of the box. In other words, with the Aimpoint PRO, you’ll be up and running in no time at all.


  • Flip-up lens covers with transparent rear cover
  • Large 30mm viewing area for use with both eyes open
  • Super durable construction
  • Waterproof tested to 150 ft
  • Easy to sight in
  • 3 years of continuous use on a single battey (no need for battey-saving tech)
  • True parallax-free operation
  • 10-year warranty for personal use


  • Might be heavier than you’d like at 6.8 oz (sight only)
  • Fewer daytime settings

#5) Vortex Crossfire Red Dot

Lastly, here’s our top budget sight for your 300 blackout pistol by one of our favorite red dot brands, Vortex Optics. Vortex Optics is like Trojan, you know they work, and they’re not terribly expensive. Compared to our previous picks, the Crossfire is a big jump down in price, bringing you into the under 200 dollars realm of red dots (at the time of this writing). First, it’s important to know that the Crossfire is all business. This means that you’re getting a reliable red dot that’s built for performance first at a very reasonable price.

First, one of the key upgrades in the latest Crossfire model is the extended battery life up to 50,000 hours on level 6 brightness. That change alone upgraded the Crossfire to take a seat with the big boys in the industry. Second, expect clear glass from Vortex’s multi-coated lens system that it incorporates into some of its popular binos. Third, there are plenty of brightness settings – 11 in total – with the two lowest settings being night vision compatible.

A handful of final highlights are the waterproof construction, two mounts included for various installations, and the hard-coat anodization for enhanced durability. Also, if you’re unfamiliar with Vortex’s VIP lifetime warranty, it’s one of those rare warranty services that actually make exchanges as painless as advertised.


  • Gets the job done for a budget price
  • Easy to mount and sight in
  • Waterproof construction
  • Up to 50,000-hour battery life
  • Easy to sight in
  • Clear, bright Vortex glass
  • Lifetime warranty


  • A bit heavy at 5.2 oz
  • Adjustments are harder than other models in our guide
  • Night vision settings are not visible without infrared or other night vision optics add-ons


Did we deliver? You don’t have to answer that because we’re that darn confident that we led you to the best red dot for your 300 blackout pistol. All of the brands and optics in this guide are reliable. Choosing just one comes down to your preferences, and we believe that our pros & cons will help you choose a single optic if you’re torn between two or more.

If we had to choose just one for our 300 blackout pistol, we’d stick with our #1 pick because Holosun’s HS510C offers incredible value for the money. The Shake Awake feature, backup solar power, and circle dot all help to set it apart from the competition. After the HS510C, we like what Trijicon and Aimpoint bring to the table, particularly because those are our two favorite red dot brands. Finally, if you take the budget route, Vortex’s Crossfire is a sure winner.

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