Best Micro Red Dot Sights Under $400 [Updated 2021]

We have put together a list of 4 best micro red dot sights under $400 that are people's favorite for handgun, rifles and shotguns.

We tested these sights on our own guns and they retained zero and perform flawlessly.

To save you time the Holosun 507C is by far the best for beginners and pros.

Let's check out what else is there:

Best Micro Red Dot Sights Under $400 [Updated 2021]

HoloSun HE507C X2 Reflex Sight - Best RMR Alternative

fn509 ls edge with holosun 507c x2

Why Buy The 507C X2 - The sight can do pretty much everything the Trijicon RMR can, and The NEW HE507C X2 is among one of their best products to buy.

Never Quit WorkingLasts over 100,000 hours plus solar power, Solar Failsafe kicks in even if the battery fails to keep you in the fight longer

Side Battery Access - Access the battery from the side. No sight removal is required nor re-zeroing

Lockout Mode - No more accidental brightness adjustment due to random button press

Same RMR Mounting Footprint - It shares the same mounting footprint as the RMR, so no need to buy a special mounts

Motion Activated Reticle –  Shake Awake technology activates the reticle upon motion and turns off when sitting at idle

Multi-Reticle System - Cycle through the following reticle options for various applications:

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

Read Detailed 507C X2 Review Here

Holosun 507K X2 - Best For Sub Compact Guns

holosun 507k x2 on hellcat pistol

Why people love Holosun 507K X2 – Conceal carry an optic pistol is so much easier with the new NEW downsized 507K X2. It fits perfectly on small handguns like Glock 43, and it's way cheaper than the new Trijicon RMRcc.

People love everything that the Holosun 407C has, now onto the 507K for CCW use.

Snag free holster draw performance - The rugged exterior housing can withstand wear against clothing, so no snag hazard when drawing out of any IWB or OWB holsters.

Activates via motion sensor - Holosun ShakeAwake technology instantly activates the reticle upon any motion & it saves battery by deactivating the reticle while in rest.

Recoil proven - The sight can handle +P ammo without any issue. No worry of optic turning off or battery compartment getting loose.

Simple battery change without hassle - The 50k hrs long lasting CR1632 battery (On setting 6) can be accessed from the side tray instead of the bottom, which eliminates the need to remove the sight for a battery change.

Read 507K X2 Detailed Review Here

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Vortex Venom - Lowest Profile Sight

vortex venom on fn 509

Why we picked Vortex - The Vortex Venom sits low on handguns and the lens is much more durable for hard use even it doesn't look like it. 

Low Profile - Compact size red dot sits low on the slide and it works for holsters made for high retention.

Clean Dot - 6 MOA size reticle works the best for people with astigmatism, and it appears much rounder and less starburst when crank up the brightness

Super Strong Low Profile Sight  - Weighing only 1.1 oz built with rugged aluminum housing, enlarged lens window with multi-coated material to increase light transmission

Large Field of View For Better Situational Awareness - Unlimited eye relief for rapid target acquisition along with parallax-free red dot that makes you shoot faster and more accurate on the clock

Read Detailed Vortex Venom Review Here

Burris Fastfire III - Lightest Weight

Burris fastfire 3 on AR15

Why Buy The FastFire III - Turn your handgun and subgun into a lightweight race gun with the FastFire 3. It's small, durable and compact for any shooting applications especially competition shooting.

Light & Tough For Speed Advantage -  Increase get-on-target speed, and use it as the primary or backup offset optic

Compatible With Very Optics Ready Handgun - Shooting pistols with a red dot sight is popular, hit targets more accurately with your handgun with this compact size optic and win your next shooting match

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Nikon P-Tactical Spur - Best For Value

Nikon p tactical spur red dot sight

Image Referenced NIKON

Why buy the NEW Nikon P-Tactical Spur - Nikon has released its first micro red dot sight. It looks and feels like something out of the Call Of Duty Modern Warfare game. It works and won't burn a hole in your wallet.

Built to Excel - The Spur is sexy, rugged and high tech, wide 27mm large FOV with multiple-coated lens allows shooting two eyes open. Weighing only 1.1 ounce able to withstand full-power tactical shotgun slug without shifting zero

Top Loading Battery Without Sight Removal - Removing the sight could shift the zero a little, eliminate the hassle of re-zeroing with the top-loading battery design to quickly change the battery without removing the sight to preserve sight zero

Sexy Exterior Construction - Built with lightweight 6061 T6 Aluminum, this shockproof optic not only look sexy but it works on rifle & PCC carbines, shotguns and pistols with its Large FOV glass for fast on target acquisition

Core Features To Look For

  • Large Window - Allows faster speed on target as soon as the shooter picks up the sight, and it will provide more room to track the dot during fast follow-up shots.
  • Recoil resistant to retain zero - High G force during the slide cycle could throw off your zero. It's very important the sight is well built.
  • Brightness Settings Adjustment - Pick an optic that lets you can adjust the dot brightness with a wide range of settings for daytime and nighttime use.
  • MOA Red Dot Size - 1 to 2 MOA dot size is common on red dot sights for distance shooting with a finer dot, and 4 MOA or up is for close range.
  • Strong Front Lens Frame - This allows the shooter to rack the slide easily against something for tactical reasons without damaging the lens.

For more information on how to use a pistol red dot, please check out the Pistol Optics Fundamental 101.

For Angled Offset Use

Arisaka-Defense offset optic mount

An offset red dot sight lets the shooter shoot around corners and barricade by canting the rifle.

Just mount them on an offset optic mount, and you are ready to rock.

Wrap Up

The Vortex Venom and HE508T are the two best products we recommend for their quality, popularity, and performance if you get them you will not disappoint.

Read More: Best red dot sights for handguns