AT3™ Mil-Spec AR-15 Buttstock Kit – Stock, Buffer, Tube, Springs, Plate


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This buttstock kit combines a Mil-Spec stock and buffer tube with all the needed parts to complete your build.

This Mil-Spec Buttstock AR-15 Buttstock Kit includes the buttstock, 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:

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


  • Buttstock: 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

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 59 reviews
steven pryor
Great buttstock.

Meets expectations for a mil-spec stock. The stock is a bit tight on the buffer tube, but that is nothing at all to worry about. Threads were a bit rough, but again, not an issue, just a bit less refined. It was attached with no problems, and I cant wait to send some rounds downrange with my 20". I went from an A2 stock to this one.

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

Larry Nabholz
450 bushmaster

Just finished bldg 450 BM at3 stockkit,two stage nickle boron trigger assy ,aero precision stripped lower.good quality fast service,great service

We're glad to hear you're happy with our products and service, Larry. Thank you for trusting AT3! -- LM

Nicholas Powell

Fit and finish was great

Thank you for taking the time to leave a review! We're glad to hear that you are happy with the fit and finish of our AT3™ Mil-Spec AR-15 Buttstock Kit. We strive to provide high quality products for our customers. If you have any further questions or concerns, please don't hesitate to reach out to us. Thank you for choosing AT3 Tactical.

Thomas McGuire

Perfect in all ways
Thank you

Thank you for the great review! We're glad to have helped you perfect your AR-15 setup.

Matthew Kisvarday
Solid product

Fit as needed and described. Tolerances better than normal. Over all quality.

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