UTG Pro Mil-Spec AR 15 Buffer Tube 6-Position Receiver Extension

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AT3 Tactical Carbine Buffer Spring for AR15

AT3™ Carbine Buffer Spring for AR-15


AT3 Tactical Carbine Buffer Weight for AR15

AT3™ Carbine Buffer (3.0 oz) for AR-15


Superior Quality Mil-Spec Buffer Tube – Unbeatable Value

The UTG Pro 6-position Mil-Spec receiver extension is precision machined from 6061 T6 aluminum forgings to true Mil-Spec dimensions. Provides a solid fit for with most aftermarket buttstocks.


  • Finish: Anodized Black, Red, Blue, Bronze, or FDE Cerakote
  • Material: 6061-T6 Aluminum
  • Weight 5.44 oz
  • Platform: AR-15 Carbine
  • Outer Diameter 1.15
  • Positions: 6
  • Dimensions 7.25″ L

Not sure if you need Mil-spec or commercial buffer tube? The below image shows the difference in dimensions

Products available on this page:

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.

UTG Lifetime Warranty

Leapers, Inc. warrants that all UTG & UTG PRO products conform to published specifications and are free from defects in material and workmanship. We will repair or replace defective products for the duration of the product’s life span. Our dedicated in-house customer service professionals will provide the best-in-class UTG experience.

Please note that this warranty does not extend to products disassembled, damaged from misuse, accidental impact, negligence, natural disasters/accidents, or unauthorized repair or alteration.

Warranty Instructions

  • Go to Warranty Request under Customer Service on our website.
  • Fill out the necessary contact and product information to the best of your knowledge.
  • A purchase receipt is required for all warranty cases and needs to be attached at the end of the form.
  • Finalize the case by submitting the information to us.
  • You will hear from one of our customer service reps within 24-48 hours and we will provide you with additional information and instructions.
  • No return will be accepted without an RA#.
  • For any questions regarding the process, please feel free to call at (734)542-1500.

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

Customer Reviews

Based on 41 reviews
Schontain Maynard
Practical part at affordable price.

It finally came and I'm really happy with the outcome. Great quality product.

Thank you for leaving a review! We are glad to hear that you are satisfied with your purchase of the UTG Pro Mil-Spec AR 15 Buffer Tube. We always strive to provide practical and high-quality products at affordable prices. Thank you for choosing us and we hope to serve you again in the future.

Not a Paid Actor
Yup, it's a Receiver Extension

UTG makes good products for affordable prices. Definitely better quality than most of the overseas Amazon knockoffs, but not top tier either.
I am liking this receiver extension so far. I ordered the FDE cerakote version. It looks nice and it fit well. Only reason for 4/5 stars is there was no wet bar or jacuzzi tub or def 5/5

Darryl M
UTG Pro FDE Buffer tube

Nice FDE Buffer tube that perfectly houses a mil spec spring and buffer, and has a no rattle tight fit to the adjustable stick, while allowing smooth transition between the six adjustments.

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

Jerry Middleton
FDE buffer tube

The buffer worked great and looks great

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

Michael Mangini
FDE Buffer Tube- Mil Spec

Exactly what I was looking for to match the rifle. Fits perfect and blends in nicely.

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