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AT3™ Mil Spec Buffer Tube Kit For AR-15

AT3™ Mil Spec Buffer Tube Kit For 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.

The perfect kit for your next build – at a price that can’t be beat.

This Mil-Spec AR-15 Buffer Tube Kit includes the buffer tube, castle nut, lock plate, 3oz carbine recoil buffer and recoil spring. All parts are designed for easy assembly and compatibility with all your other AR-15 components.

Backed by the AT3 Lifetime Warranty.

Included in the kit:

  • 6 position Mil-Spec buffer tube
  • 3oz carbine recoil buffer with T6 anodized aluminum body
  • Steel Buffer Spring
  • Steel castle nut
  • Steel end plate


  • Buffer Tube Diameter: 1.146″ (Mil Spec)
  • Buffer Tube Length: 7 1/4″
  • Buffer Tube Thread type: 1 3/16-16 UN-3B SPECIAL
  • Buffer Tube Material: 6061-T6 Aluminum
  • Buffer Tube Finish: Black Anodized
  • Spring Type: Carbine length, black coated
  • Castle nut type: Steel with phosphate coating
  • End plate type: Steel with phosphate coating
  • Recoil spring type: Steel
  • Buffer type: 3oz weight, carbine style

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Customer Reviews

Based on 16 reviews
Fast shipping, Quality Product

Was exactly what I needed and shipped same day. Thanks!

Thanks for sharing your feedback, Brad. We're glad you're satisfied with your purchase. Cheers!
I don’t do reviews

It is what it is. Needed a mil spec diameter tube thx

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

Worx no issues

Thanks for sharing your feedback, Charles. We're glad you're satisfied with your purchase. Cheers!
Made in China? Needs to be packaged better/inspect parts before shipping.

Items arrived quickly. Came in bubble envelope, and parts were in plastic baggy. Buffer and buffer tube both had knicks in them. Testing fitment on my brand new CTR stock, it rattles like a m4 stock on this buffer tube.

Sorry to hear about the issue, Paul. I sent you an email to resolve the issue.
AT3's Own Buffer Tube Kit

These were very nice goodies. Fit and finish were fine, and I don't know where you could beat this kit at this price point.

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