AT3™ DELTA 3x Red Dot Magnifier with QD Flip-to-Side Mount
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6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
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- 90-day no-hassle returns policy
- Backed by the AT3 Lifetime Warranty! what it covers
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The DELTA has better glass clarity, longer eye relief, and an excellent QD mount!
The DELTA is AT3’s new red dot magnifier, boasting a long 3 inch eye relief, a broad field of view, and enhanced clarity for making accurate, long-range shots with your red dot sight. This magnifier works with any red dot sight with absolute or lower 1/3 cowitness using the included spacer, making it perfect for enhancing your AR-15. Plus, you can swap this magnifier between rifles easily with the included quick detach mount, with a ratcheting adjustment that ensures a tight, secure fit on your rail.
We recommend pairing the DELTA with our ALPHA red dot sight, for a fully featured, modern red dot and magnifier setup. You can get the ALPHA and DELTA as a set here, with a bundle discount to enhance your rifle, and prepare you for any shot from point blank to 500 yards or more!

Better Eye Relief and Sight Picture
- A full three inches of eye relief ensures you’ll have a clearer view of the target, even with backup iron sights installed!
- Multicoated glass gives you a more crisp view of your target, with better light transmission and definition.
- 38 foot field of view gives you a clear picture of what’s around your target, with a forgiving eyebox for head movement.

Flexibility Between Rifles
- The Quick Detach Mount is our best yet, with an audible ratcheting adjustment for tight, consistent installation.
- Switch the Delta between multiple rifles with the fast QD lever, and ensure your red dots have magnification when you need it.
- Out of the box Absolute Cowitness height – and with the Cowitness Spacer, Lower 1/3 Cowitness for even more optics compatibility.

Durable and Rugged
- Solid steel lockup in the mount keeps the magnifier secure without the need for a release button or lever.
- Rubberized shroud keeps the magnifier protected from bumps and scratches in the field.
- Durable enough to handle recoil from high caliber rifles, shotguns, and even .50 BMG. Yeah, we went there.
- For anything else, you’re covered under AT3’s Lifetime Warranty. If there’s an issue, we’ll take care of you.
Inside the box
- DELTA Red dot magnifier with QD Mount
- Cowitness Spacer
- Instruction sheet
- Lens cloth
- 3mm Allen Wrench
- Longer Screws for Spacer
Specifications
- Magnification: 3x
- Objective Lens Diameter: 20 mm
- Height: 1.43inches/36.5mm from the base to center of the optic (Absolute Cowitness)
- With the use of the Lower 1/3 Cowitness spacer, height is 1.57in
- Eye Relief: 3.07 inches/78.2mm
- Exit Pupil: 6.7mm
- Field of View: 7.28°/38.3 ft @ 100 yds
- Length: 3.98 inches/101mm
- Weight: 12 oz. with mount
- Optics Coating: Fully multi-coated
- Waterproof Rating: IPX7
- Housing Material: 6061-T6 anodized aluminum
- Finish: Hardcoat Anodized
- Included in the box: QD flip to side mount, 3X magnifier, Cowitness spacer with mounting screws, Tools, Lens Cleaning Cloth
Customer reviews 15
thank you AT3
keep up the good job
AT3 Tactical · Thanks for the great feedback, Jerome! We're glad to hear the magnifier was easy to mount and that the instructions helped you dial in the perfect view. Enjoy the setup!
AT3 Tactical · Thank you so much for your kind review. We're thrilled to hear that you are pleased with the quality of our AT3™ DELTA 3x Red Dot Magnifier with QD Flip-to-Side Mount. We strive to provide top notch products at affordable prices, and we're glad that you feel we have achieved that. Thanks again for choosing our product!
Came with a lower Co-witness plate to match the level of my green dot.
Easy to lean out of the way so as to only use the green dot.
Clear focus and good magnification.
I'm satisfied with the choice that I made.
Thanks AT3Tactical.
AT3 Tactical · Thank you for taking the time to leave us a review! We're glad to hear that our AT3™ DELTA 3x Red Dot Magnifier was able to add the perfect amount of magnification for your DB-15. Our flip-to-side mount is designed for easy installation and uninstallation, making it convenient for your shooting needs. We're also happy that the lower Co-witness plate was a perfect fit for your green dot. We take pride in providing clear focus and good magnification for our customers. Thank you for choosing AT3Tactical and happy shooting!
AT3 Tactical · Thank you for taking the time to leave a review for our AT3™ DELTA 3x Red Dot Magnifier! We are happy to hear that you find it to be almost perfect and appreciate its durability and ease of use. We understand that there may be some differences in glass quality compared to higher-end magnifiers, but we are glad to know that it still meets your needs at a more affordable price. Thank you for choosing our product and for your feedback!
After removing my red dot so that the magnifier could be mounted, I reinstalled the red dot and did an initial test in my garage. I can't wait to get this to the range!!! Extremely well made and easy to install.
AT3 Tactical · Thank you for your review of our AT3™ DELTA 3x Red Dot Magnifier with QD Flip-to-Side Mount. We're ecstatic to hear that it was a perfect addition to your setup, especially as a left-handed shooter. We take pride in creating high-quality and user-friendly products, and we're glad it met your expectations. Happy shooting and stay safe! - The AT3 Tactical Team
AT3 Tactical · Thank you for leaving a review for our AT3™ DELTA 3x Red Dot Magnifier. We're glad to hear that it went on easy and zeroed easily to your RD-50. We understand your concern about the windage and elevation settings not having a lock feature. We will definitely take note of this for future improvements. Thank you for bringing this to our attention and we hope you continue to enjoy your magnifier.
Questions & Answers 4
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Warranty & returns
Backed by the AT3 Lifetime Warranty!

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.
This includes AT3 Red Dot Sights, Handguards, Iron 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.
90-day no-hassle returns
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.




DELTA Instruction Manual













