AT3 ARO™ Micro Red Dot Reflex Sight with Optional Riser Mount

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AT3’s Smallest and Most Versatile Micro Red Dot Sight

Even a great sight can be made better.  In addition to all models now shipping with a rubber cover, the ARO’s housing is smaller, allowing it to ride on top of your red dot pistol slide cut for Fastfire or Venom pattern optics.  The ARO still boasts the largest viewing area of AT3’s Red Dot Sights, and it can be used on just about any rifle or pistol platform.  As a primary or backup optic on your AR, a sleek reflex sight for your hunting rifle or shotgun, or even riding on a pistol slide, the ARO can do it all – at a price that won’t break the bank.

Need a Mount for a Pistol?

Built For Every Platform

The ARO reflex sight is built to take on just about anything!  It can be used on rifles, shotguns or your favorite optics-ready pistol.

A Dot with a View

  • This is our smallest red dot sight, with the biggest viewing area – with none of the bulk of a standard tube
  • Multi-coated lenses are scratch-resistant and provide excellent image clarity
  • Crisp 3 MOA red dot allows for accurate, both-eyes-open shooting on any platform
  • Parallax free design: The red dot stays on target, no matter where the shooter’s eye is
  • 6 red dot brightness settings provide optimal visibility in any lighting conditions

Truly Adaptable

  • The ARO uses a Fastfire/Venom Style Mounting Footprint and includes a removable Low Mount for Picatinny or Weaver Rails
  • We also offer a .83″ Absolute Cowitness Cantilever Riser Mount for Picatinny Rails – Ready for Duty with your AR15
  • Mount it on your rifle, shotgun, or pistol – the ARO is built to take on just about everything!
  • Waterproof circuitry ensures you’ll stay on target even in adverse conditions
  • Shockproof circuitry resists damage, even when the dot takes a beating – from impact or recoil

AT3’s Most Versatile Red Dot

The ARO Reflex Sight is able to be directly mounted to many popular “Optics Ready” pistols on the market that utilize a Burris Fastfire/Vortex Venom mounting pattern – either directly on the slide or via an adapter plate.  Here is a list of pistols that the ARO is compatible with.  This may not be a complete list.  If you know of another pistol that the ARO fits on, please email us that information at If you have specific questions about the ARO fitting on any pistols, please contact the gun manufacturer directly.



Beretta APX RDO
Canik TP9SFx
Canik TP9 Elite Combat
FN 509 Tactical
FN 509 Compact MRD
Glock G17 Gen5 MOS
Glock G19 Gen5 MOS
Glock G22 Gen5 MOS
Glock G23 Gen5 MOS
Glock G34 Gen5 MOS
Glock G40 Gen4 MOS
Glock G41 Gen4 MOS
Glock G45 MOS
H&K VP9 Optics Ready
Ruger 57
Springfield Armory XD-M OSP
Taurus G3C TORO
Taurus G3 TORO
Walther PDP FS 4
Walther PDP Compact
Walther Q4 SF Optic Ready
Walther Q5 Match
Walther PPQ M2

If you have other questions on pistol red dot mounting solutions, be sure to check out the Optics Ready Pistol Bible!

High Value, Light Cost

  • No other Micro Red Dot has an AR-ready riser mount at this price.
  • The ARO is factory-direct – no markup from distributors.
  • Up to 5,000 Hours of Battery Life at Medium Brightness
  • CR1632 Lithium battery included.
  • Backed by the Lifetime AT3 Warranty. We stand behind our products!

AT3 ARO Micro Red Dot with Top Loading Battery Cover

About Riser Mounts

  • No Mount – For Direct Mounting to Fastfire/Venom Adapters and Slides
  • Low Mount – For Direct Mounting to Picatinny or Weaver Rails
  • Med Profile .83” Riser Mount – Mounting to Picatinny Rails for Absolute Cowitness with AR iron sights

Not sure what that all means?  Check our FAQ below!

Inside the box:

  • ARO Red Dot Sight
  • NEW Rubber Lens Cover
  • CR1632 Battery
  • Low Picatinny/Weaver Mount
  • Instruction sheet
  • Lens cloth
  • Allen wrench for Windage Adjustment
  • Torx Wrench for Mounting Screws
  • Flathead Screwdriver for Battery Cap
  • OPTIONAL: .83″ Absolute Cowitness Picatinny Riser Mount

Red Dot Sight Technical Specs

  • Power / Obj. Lens: 1x23mm
  • Reticle: 3 MOA Red Dot
  • Lens Coating: Multi-coated
  • Weight: 1.8 oz
  • Mounting Length: 1.9 inch / 48 mm
  • Mounting Width: 1.1 inch / 28 mm
  • Height: 1.2 inch / 30 mm
  • Objective Lens Area: 23mm x 21 mm
  • Battery Type: CR1632 (Battery Included)
  • Battery life: Approximately 5,000 Hours on Medium Setting
  • Auto Shut-off: 6 Hours
  • Windage/Elevation Click Value: 1 MOA per click
  • Adj Range: +/- 50 MOA (total adjustment range 100 MOA)
  • Eye Relief: Unlimited
  • Parallax Adjustment: Fixed
  • Field of View: Unlimited
  • Night Vision Compatible: No
  • Nitrogen Filled: Yes
  • Waterproof/Fogproof: Yes
  • Recoil resistance – Certified up to 500g’s. Certified for use with large-caliber rifles and shotguns, as well as “springer” airguns with 2-way recoil
  • Body material: 6061 Aluminum
  • Finish: Matte black anodized

ARO Cantilever Riser Mount Technical Specs

  • Mount Type: Burris Fastfire/Vortex Venom Footprint
  • Length: 1.6″
  • Material: Black Anodized Aircraft Aluminum
  • Saddle Height: .83″
  • Weight: 1.1 oz

Frequently Asked Questions

Q: How do I mount the ARO to my pistol?
A: The easiest way to mount the ARO to a pistol slide is by using an adapter plate in the Fastfire Pattern.  AT3 carries adapter plates that can be used simply by drifting out the rear sight of many popular pistols on the market.  The ARO may not fit in pistol slides cut specifically for Fastfire red dot sights.

Q: How do I know which riser mount to get?
A: For AR’s and other modern rifle platforms, we recommend the .83″ Mount if you are running without iron sights since it puts the red dot at the standard height of mil-spec iron sights. If you’re running a shotgun, pistol, or any firearm with a “drop comb” where the cheek rest is lower than the top of the receiver, the Low Mount will serve you just fine.

If you go with the .83″ Mount, you’ll also get the Low Mount – if you plan to move the optic around multiple platforms, go with that option!

Q: Do I need to use iron sights along with the ARO Red Dot Sight?
A: NO – Iron sights are not required to use this red dot sight! The red dot sight can be used on its own. Many people choose to use iron sights as a backup, but they are optional. This red dot sight will work great on “optics ready” rifles that don’t have any iron sights.

Q: What is the recommended torque for the top screws that thread into the mount?  Do I need Loctite/threadlocker?
A: We recommend no more than 12 inch-lbs for torque on the two top screws, no matter what you’re mounting the ARO to.  You do not necessarily need threadlocker, but it is highly recommended, especially on handguns.  A small drop of Blue Loctite or equivalent medium threadlocker on each screw will suffice.

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 141 reviews
Ben Martin
Nice piece

Added this mini to my Taurus M-66 and it’s a quality piece to top off my build. Easy to dial in, and comes with the tools to mount and adjust. I’ll probably get another for my AR-15 build

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Jesse Seelhoff
Solid dot

Got the ARO mounted on my 1911 in 10mm. Has held zero and makes target acquisition easy. Big improvement compared to the wide Bomar sights

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Updated review

I went to an Indoor range after bore sighting my 12ga. MKA1919. The first 5 shots @20 yds. Are in in the picture. There's is One button operated for everything makes it simple. I'll dare to say that this can give the Vortex line of reflex sights a great lowercost option. V
Eternal owned and made 1

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Dustin Comfort
Very well priced

I received my AT3 ARO today and I have only unboxed it but give it a 5 star only because I know AT3 products. I have the big name optics and they are great... however the cost is 50% lower and the torture tests I have seen done are insane! They give you confidence knowing your shits gonna work and stay zeroed

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

James F
Awesome Red Dot

I have not tried this out at the range yet. It fits nicely on my Canik 9 mm using mounting plate number 1 that came with the pistol. Very easy to mount and it's not bulky. I also have a AT3 RD- 50 on a AR 15 pistol that works very well.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.