4 Best Red Dot Optics For AR15 Under $300 [2022 Updated]

You don't need to spend $800+ on an optic to get good at shooting. In fact you can do it for less with these 4 best red dot sights for AR15 under $300. We picked these based on our own 4+ years of usage, durability, battery life and cost.

Check them out:


Best Red Dots For ARs Under $300

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Holosun 510C - Best Overall

Holosun 510c on ar15

Why people love this one - The Holosun 510C reflex sight feels like an EOTech with a large field of view for target practice and competition. The raised optic height sits perfectly on the AR15 for most people's cheek weld positions.

Large Lens Window For Faster Shooting - This parallax-free red dot sight is easy to aim with both eyes open while shooting on the move or transitioning

Versatile Reticle System - Use the large CQB 65 MOA reticle circle for range estimation and it's perfect for fast close-range holdover

Solar Fail Safe - Solar panel kicks on if the battery dies in the field

Multi-Purpose For Various Firearm Platforms - Use it on any firearm other than AR15 thanks to its simple QD lever mount

At this price point, this is one of the hottest selling red dot sight that most new shooters are buying.

Read in-depth 510C review here

Holosun 515GM - Aimpoint Micro Alternative

"I have tested the Holosun 515GM long enough, and it performs extremely well, and I believe this is the bang for your buck you can possibly get" - John Lovell (Former Spec Ops), Warrior Poet Society (Watch His Review Here)

For people who love Aimpoint Micro - Holosun 515GM is an affordable option for people who love the Aimpoint Micro but don't want to spend over $800. It looks and feels just like an Aimpoint Micro at 1/3rd the price, and the battery lasts about 50,000 hrs like the Aimpoint.

As far as durability goes, the HS503GU is made with 7075 T6 aluminum body up to the mil-spec standards. The optic shares the same mounting footprint as the Aimpoint Micro so you can use the same mount.

Besides the obvious, the HS515GM features its 65 MOA ring with a center dot for faster CQB target acquisition than just a 2 MOA dot. The user can also toggle switch to a 2 MOA dot for eliminating reticle obstruction by holding the "-" button for 3 seconds. Vice versa

Added Honeycomb flash hider - For tactical advantages, the Honeycomb flash hider eliminates lens glare so bad guys can't see you during sunny daylight

Recoil proof - The optic can retain zero perfect when handling 9mm, 5.56, 7.62 and 6.5 CM recoil, so use this with confidence on your AR and other carbines.

Holosun 507C - Best Offset Optic

valhalla tactical RUKH offset mount side view


More Cost Effective Than Trijicon RMR - The Holosun 507C is a great Trijicon RMR alternative for its durability and overall performance.

Low profile optic setup - Mount it on any offset red dot mount while using the same Trijicon RMR footprint. 

Cost Effective - One thing people love about the Holosun 507C is it's much cheaper than an RMR and it does the same thing.

Solar Panel Power - When the battery finally dies, the solar panel power will kick on and functions like an fiber optic sight under ambient lights

Side Loading Battery - No sight removal required for battery swap and re-zeroing. Access the battery from the side tray

Multi-Reticle - Switch between

  • 2 MOA Center dot
  • 32 MOA circle
  • 32 MOA circle + 2 MOA Dot

*Change by pressing the minus button for 3 seconds.

The 32 MOA circle helps significantly for picking up the sight faster because it's big and easier to see.

Read in-depth 507C review here

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Primary Arms

Sig Sauer ROMEO 5 - Best For The Money

sig romeo 5 with juliet 4 magnifier

The Sig Romeo 5 is a robust and compact 1X20mm red dot sight just under $150. It's by far the hottest selling optic for most AR rifles and pistol carbines before moving onto something more fancier.

Standard 2 MOA Dot For Fast Aiming - The 2 MOA dot is standard for most red dot optic for fast target acquisition and pin-point accurate shooting when using a magnifier

No Lens Tint - Very little lens tint under the sunlight or low light

Uses Aimpoint Mounts - Use any Aimpoint Micro mounts readily available on the market

Extended Battery Life - Runs up to 50,000 hours of battery life without having to turn it off

MOTAC - Motion sensor deactivates the reticle when sitting in idle to save more battery

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ddmk18 red dot aimpoint micro

For higher end red dot optics, please check out our main page here