4 Best Red Dot Optics For AR15 Under $300 [2021 Updated]

Referenced Movie Helios

You don't need to spend $800+ on an optic to feel confident with your rifle!

In this buyer's guide, we focus on the 4 best red dot optics for AR15 under $300 that work as good as high end products based on their durability, battery life, reticle and money for value.

As the optics technology continues to improve & prices are dropping without quality compromises.

If you want to check out the high end stuff, please check out this guide instead.

Otherwise let's check out what you can get for under $300!


Best Red Dots For ARs Under $300

Holosun 510C - Best Overall

holosun 510c on CMMG rifle

Why people love this one - HoloSun makes some of the most popular optics for handguns, rifles and shotguns on the market right now. This sight is feels like an reversed  EOTech with a different aesthetics. The raised optic height sits perfectly on the AR15 for perfect cheek weld rest.

Large Lens Window For Faster Shooting - Lens size is an important spec of how fast you shoot and track the dot in a match, parallax-free holographic sight with unlimited eye relief with this large POV to instantly place the dot on the target while shooting on the move or transitioning with both eyes open

Versatile Reticle System - Large CQB 65 MOA reticle circle for range estimation, perfect for accurate close-range shooting with a rapid holdover reference point

Solar Fail Safe - Solar panel extends the battery life longer to keep you in the fight longer without ever changing the battery even

Multi-Purpose For Various Firearm Platforms - Use it on any firearm is a good indication of how useful the optic is, using the improved QD mount with an adjustable clamping force to go on any firearm including heavy caliber centerfire rifles

At this price point, which is the lowest it’s ever been for a reflex sight like this one, You’ll save a ton of money. Just make sure to click the button below for the best deal.

Holosun 515GM - Aimpoint Micro Alternative

holosun 515gm red dot sight
"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 Low Drag RDS

Arisaka-Defense offset optic mount

Better option than Trijicon RMR - The Holosun 507C is clearly beating the Trijicon RMR on sales because it's affordable and has the same durability.

Low profile optic setup - If you want a super low profile, lightweight and low drag setup, the Holosun 507C is the go to for a compact & streamlined carbine setup as well as a viable offset red dot option 

Cost Effective - One thing people love about the Holosun 507C is it's much cheaper than an RMR and it does the same thing, and it shares the same mounting footprint, so if you don't have to buy a special mount for the 44 mag revolver if it already has picatinny top rail.

Another feature the Holosun 507C has is the multi-reticle system, which allows the user to pick from:

  • 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.

For the cost of this optic, you can get almost 2 Trijicon RMR’s. The battery life is great, and you will not disappoint. Check out the link below to get the best deal on OpticsPlanet

Vortex Crossfire 2 - Best For The Money

Vortex Crossfire 2 red dot sight on ar15

The Vortex Crossfire II red dot sight is a no-nonsense sight at a affordable price point for darn near any shooting application. It does what the Holosun 515 can and it's much targeted for the beginner AR15 market.

Standard 2 MOA Dot For Fast Aiming - The 2 MOA dot unlimited eye relief is quick to acquire in close-quarters, while remaining fine enough to promote pin-point accuracy at extended range

Accepts Aftermarket Aimpoint Mounts - Use any Aimpoint Micro mounts readily available on the market to fit your ergonomics / tactical need

Extended Battery Life - Unlike other earlier reflex red dots from Vortex Optics in the past, the Crossfire II features up to 50,000 hours of battery life to operate night-vision & daytime mode at the lowest two settings, the Crossfire red dot will keep working in a variety of conditions

Increased Head Movement - More flexible shooter's head movement when aiming down the sight.


Final Thoughts

As optics technology improves overtime and the demand increases, the price will continue to drop.

These $300 range red dot sights have performed very well in the shooting community in the past couple years. 

I hope you find this content helpful and please checkout other content on our site.