AT3™ 4xRDM™ 4x Red Dot Magnifier with Flip-to-Side Mount


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Go from fast up close to precise at long range, with AT3’s new 4x Magnifier with QD Mount

Experience the latest and greatest AT3 Red Dot Magnifier, with a new Quick Detach mount and a crystal-clear 4x magnification for any AT3 Red Dot Sight.


  • Easy upgrade to extend the range of any red dot sight with 4X magnification
  • Quickly transition between short- and long-range shooting scenarios. Just push the button and flip the magnifier over.
  • Spacers are included for Absolute and Lower 1/3 Cowitness Red Dot Sights – whatever your sight height, the magnifier will work!
  • The Quick Detach Mount means you don’t need to carry extra weight if the job doesn’t demand it – just flip the lever to add or remove


  • Crystal-clear multi-coated optics for a sharp sight picture
  • Adjustment screws make it simple to center the red dot in the sight picture
  • Fast focus adjustment ensures a crisp sight image


  • Sturdy flip-to-side mount with a positive locking mechanism, made of durable 6061 T6 aluminum matte anodized finish
  • The shockproof optic is built to withstand the recoil of any weapon, including shotguns and large-caliber rifles
  • Scratch-resistant optical coating
  • Backed by the AT3 Lifetime Warranty

Important fit note:

This magnifier is designed for use with the AT3 RD-50 PRO and LEOS Red Dot Sights, as well as many other sights that use riser mounts.  The included spacers correspond to most “Absolute Cowitness” and “Lower 1/3 Cowitness” riser heights for red dot sights.  Installation of either spacer is simple and allows you to have more accurate


  • Magnification: 4x
  • Objective Lens Diameter: 32 mm
  • Height: 1.4in from the base center of the optic (Absolute Cowitness). With the use of the spacer, height is 1.57in
  • Eye Relief: 2.5 in
  • Exit Pupil: 7.0mm
  • Field of View: 49 ft @ 100 yds
  • Length: 4.6in
  • Weight: 12oz with mount
  • Optics Coating: Fully multi-coated
  • Material – 6061 T6 anodized aluminum
  • Included in the box: QD flip to side mount, 4X magnifier, Hex key, Stamped Wrench, Lens Cleaning Cloth, Spacers, and mounting screws

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 20 reviews
Doug Bennett
AT3™ 4xRDM™ 4x Red Dot Magnifier

These things work GREAT! I have several 3x & 4x magnifiers plus their Red Dots with Laser, and all work GREAT!

Thank you for the kind words! We are glad to hear that our products are serving you well.

Not good for duty use

I wanted to love this as much as I love the at3 red dot I bought for my duty rifle. Unfortunately, this magnifier keeps moving from the vibration of being in the rack in my squad. The magnified red dot is centered at the start of my shift, it is way left or right by the end. As I look through it all I have to do is tap the side of the magnifier with my palm and watch the red dot move all over the place. They very quickly sent me a replacement so definitely 5 stars for customer service, but the replacement one did the same exact thing. Time for a refund.

Thank you for bringing this issue to our attention. We apologize for any inconvenience caused by the movement of the magnifier. Our team is dedicated to providing high-quality products, and we are sorry to hear that this one did not meet your expectations.

We have taken note of your feedback and will work towards improving the design to prevent any movement in the future. We truly appreciate your loyalty to our brand and hope to have the opportunity to make it right for you.

Please reach out to us for a full refund, and we would be happy to assist you. Your satisfaction is our top priority, and we thank you for giving us the chance to address this matter.

Joseph Carrera

Great price, very well constructed and easy to install. 4x magnifer clear and easy to adjust

Thank you for your positive review! We're glad to hear that you found our AT3™ 4xRDM™ 4x Red Dot Magnifier to be well-constructed and easy to install. We take pride in offering quality products at affordable prices. It's also great to know that the 4x magnifier was clear and easy to adjust for you. We appreciate your feedback and hope you continue to enjoy your purchase.

SDC Indiana
At3 4 x magnifier

Easy install, easily adjusted, fast shipping. Thanks to you and your crew

Thank you for your review. We're glad to hear that you're enjoying the magnifier. We're sorry that you had trouble installing it, but we're glad that you were able to adjust it quickly. Thanks again for your feedback.

Eric Defrancesco

So far I love it good clear magnification I'll see how it holds up but so far so good.

Thank you for the review! We're glad to hear that you're enjoying the 4xRDM magnifier.