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AT3™ Mil Spec Buffer Tube - AR-15

AT3™ Mil Spec Buffer Tube – AR-15

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Lifetime WarrantyOn All AT3 Brand Products

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.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

This 6-Position AR-15 Mil-Spec buffer tube is perfect for your next AR-15 build, or as an upgrade on existing commercial-spec tube.

Made 6061-T6 aluminum construction with a black anodized finish, with six precision machined notches to securely lock your stock into position.


  • Tube Diameter: 1.146″ (Mil Spec)
  • Length: 7 1/4″
  • Thread type: 1 3/16-16 UN-3B SPECIAL
  • Material: 6061-T6 Aluminum
  • Finish: Black Anodized
  • Backed by the AT3 Lifetime Warranty

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Customer Reviews

Based on 19 reviews
Thoughts on a buffer tube

Buffer tubes are pretty simple devices, I ordered a Mil-spec tube fit perfectly, no problems. What more can be said

Thanks for sharing your feedback, Jerome. We're glad you're satisfied with your purchase. Cheers!
top notch product

Super fit and function, threads well cut, no problems at all with this product.

Thanks for sharing your feedback, Eric. We're glad you're satisfied with your purchase. Cheers!
Works Great

Fits my AR 15 with no problem. An Adaptive Tactical EX Performance Mil-Spec adjustable recoil pad slides right over the AT3 buffer tube as though they were made for each other. The price is affordable and shipping is fast. I would buy an AT3 Mil-Spec Buffer Tube again.

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

Looks and feels like a solid piece of equipment. I tried it with multiple mil spec stocks and they all lock up right. Fit perfectly on my Spikes lower. Buy with confidence.

Thanks for sharing your feedback, West Side Willie. We're glad you're satisfied with your purchase. Cheers!
5 star

AT3 is a stand up company. Their products and quality is great!!! No one ever wants an issue with an order, but hey it happens we are all human. What you can count on is if there are any issues AT3 will stand behind it and take care of it immediately. They ship promptly and their technical support and customer service is 2nd to none.

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