LBE Unlimited Buffer Tube for AR-15 – MILBUFKT

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LBE Complete AR-15 Mil-Spec Buffer Tube Kit

The LBE Unlimited Mil-Spec Buffer Tube Kit for the AR15 comes with a buffer tube, castle nut, lock plate, recoil buffer and recoil spring. This kit is ideal for finishing out your AR-15 recoil system with quality components. The mil-spec stock diameter leaves you a ton of options for mounting a buttstock or pistol brace on your AR-15 build.


  • Mil spec lower receiver buffer tube extension kit
  • Aluminum construction – Light and strong


  • Material: Aluminum
  • Finish: Matte black, Colt Gray, Red, and Brown
  • Includes: Buffer tube, castle nut, lock plate, recoil buffer and recoil spring

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

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.

LBE Unlimited Warranty

  • For warranty information about LBE Unlimited products, you can email them directly at

Customer Reviews

Based on 4 reviews
Buffer tube

Bought this part, along with a number of other parts from AT3 Tactical for my first build. Great product, shipped quickly, great customer service. Have yet to shoot it, so I can't speak to how well it is while shooting

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

Great product

I bought it for my first build. Rock solid product, better than I expected for the price. AT3 got it out fast - I received it a day ahead of schedule! I highly recommend this product to anyone

We are glad to hear that you are happy with your order.

Buffer Kit

Great buffer kit, was able to finish my build quickly due to prompt shipping. Quality of kit is excellent, very pleased. Thanks

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

Buffer rude review

Fast shipping and quality, fit and price were all great. Good stock on hand I will order again.