KZ AR15/M4 Receiver Extension Buffer Tube Block

(8 reviews) Write a Review
  • Designed to aid in the assembly of lower receivers. Once the armorer has installed the buffer tube onto the lower; the buffer tube and lower receiver assembly can be slid into the duo rings at the 12, 3, 6 and 9 o’clock positions.

This allows the armorer to rotate the lower in 90 degree increments in the block simply by loosening the provided nylon screws, removing the lower, and sliding it back in at the desired orientation. 

The Reaction Block provides an ultra-stable platform for performing an array of lower receiver operations, as well as making the installation of the buffer retainer nut quick and easy. All while keeping both hands of the armorer free to work, saving both time and frustration.
  • KZ AR15/M4 Receiver Extension Buffer Tube Block
  • KZ AR15/M4 Receiver Extension Buffer Tube Block
  • KZ AR15/M4 Receiver Extension Buffer Tube Block
  • KZ AR15/M4 Receiver Extension Buffer Tube Block
  • KZ AR15/M4 Receiver Extension Buffer Tube Block
  • KZ AR15/M4 Receiver Extension Buffer Tube Block

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Frequently bought together:


The Kley-Zion Buffer Tube Buddy was designed for assembly and maintenance of the AR15/M4 lower receivers.


  • Will work with both mil-spec & commercial buffer tubes
  • Mounts receiver in 12, 3 , 6 or 9 o'clock positions
  • Two polymer screws firmly holds buffer tube in position.
  • Mounts in any vice
  • 6061 T6 Aluminum
  • Clear, Type II class III hard Anodized
  • Only, 3.5" wide, 6" tall
  • Lightweight only 11.6oz
  • Lifetime warranty
  • 100% Made In USA

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to (California law requires this warning to be given to customers in the State of California.)

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Additional Information

Product ID:
Armorer's Tools
Made In USA
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8 Reviews

  • 5
    Solid Piece of Kit

    Posted by Ed on 23rd May 2019

    This tool serves a single purpose and it works. Simple as that. Zero complaints and it gets the job done. Unless you just have to have a name brand, there's no need to spend the extra money. Buy with confidence.

  • 5
    Review of the Tube Block

    Posted by Mark M on 16th Sep 2018

    Solid tool, not sure what else you would need from it. Maybe two more screws on the other side? Worth the price!

  • 5
    Buffer tube block

    Posted by Kasey Nielson on 11th May 2018

    This thing is awesome! It holds the buffer tube rock steady while torquing the castle nut. Definitely worth every penny.

  • 4
    It works!

    Posted by seswho on 24th Apr 2018

    Got this device and used it right away to exchange the end plat on my AR15 build. It held the buffer tube perfectly so I could tighten down the castle nut.

  • 5
    Easy to use and protects

    Posted by michael f. on 19th Apr 2018

    Easy to use and protects the receiver from damage.

  • 5
    Very handy tool

    Posted by Jeremy on 12th Apr 2018

    I had my doubts, but id's very well made.
    Did I mention the great price?!

  • 5
    Very happy with the tools

    Posted by Jerry J. on 20th Mar 2018

    Very happy with the tools and they worked well. Looking forward to future purchases with Botach!

  • 4
    Great product. The flats on

    Posted by Thomas K. on 5th Jan 2018

    Great product. The flats on the bar make it easier to clamp in the vice. Other similar products don't have the flats and the bar keeps slipping out of the vice jaws. I intend to have a machine shop replicate the flats on my brownells bar.

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