Luth-AR Mil-Spec 9mm Buffer Tube Assembly for AR-15

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Luth-AR 9mm Buffer Tube Kit

This 9mm buffer tube kit from Luth-AR includes a heavy 5.45 oz. buffer, spring, mil-spec tube, plus castle nut and end plate. This assembly threads onto a standard AR-15 lower receiver, and is ready for the mil-spec stock of your choice. Be sure to choose the right AR-15 lower receiver if you’re planning a fresh build, or pick up a 9mm conversion block for a standard lower receiver.


  • Mil-Spec Carbine Tube
  • Carbine buffer spring
  • 9mm 5.45 oz. buffer
  • Latch Plate and Lock Ring


  • Buffer Tube Material: 6061-T6 Aluminum
  • Buffer Tube Finish: Hardcoat anodized
  • Buffer Weight: 5.45 oz.

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.