Luth-AR .308 Mil-Spec Carbine Buffer Tube Kit

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High Quality Mil-Spec Carbine Buffer Tube Kit for AR-10/.308 Rifles

If you’re planning to build or upgrade your AR-308, it’s critical to choose the right buffer tube kit. This buffer tube kit from Luth-AR features a mil-spec diameter for stock compatibility, plus a .308 carbine spring, buffer, castle nut, and endplate. And it’s all made in the USA.


  • Mil-Spec Carbine Tube
  • .308 buffer spring
  • .308 carbine buffer
  • Latch Plate and Lock Ring


  • Buffer Tube Material: 6061-T6 Aluminum
  • Buffer Tube Finish: Hardcoat anodized
  • Buffer Weight: 3.8 oz. (.308 Carbine)

Not sure if you need Mil-spec or commercial buffer tube? The below image shows the difference in dimensions. For more information, please read our article, “Mil-Spec vs. Commercial AR 15 Buffer Tubes – Which One is Better?“.

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.

Luth-AR Limited Warranty

  • Luth-AR, LLC manufactured products are warranted for 1 (one) year from the date of purchase against manufacturing defects in material and/or workmanship. All parts and labor or replacement, at our option, are covered.
  • Government fees, damage caused by failure to perform normal maintenance, sales outside the United States, damage due to high velocity, high pressure, reloaded, or other non-standard ammunition, or any unauthorized repair, modification, misuse, abuse, or alteration of the product is not covered by this limited warranty.
  • Consumable items such as gas rings, O’ rings, etc., are not warranted.
  • Luth-AR, LLC complete assembled uppers will be warranted for a period of 1 (one) year after the complete upper was purchased.
  • The warranty applies towards defects in materials or workmanship of the complete upper. Luth-AR will pay for all warranty repairs, at no charge to the consumer. Please supply a copy of the invoice for proof of purchase.
  • The use of re-load ammunition, proof rounds, or factory ammunition that exceeds initial SAAMI specifications voids any warranty. Any repairs or modifications not done by Luth-AR also voids any warranty.
  • Complete uppers not assembled or built by Luth-AR are not covered by the 1 (one) year warranty.
  • Please call our warranty department at (763) 263-0166 or email for any warranty issues.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 2 reviews
Great part, great price!

Excellent response to my question about the part. Installed easily and looks good! Professionals at AT3...

Great buy

Shipping time was great price was great my stock fit perfectly! Was a pleasant experience

We are happy to hear you enjoyed the experience of buying from AT3 Tactical.