CAR-15 Buttstock - Aluminum Assembly / XM177/ Commando/ AR-15 SP1 Sporter

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This is a reproduction of the Aluminum sliding Buttstock for the XM177, 1970's model Commandos and AR-15 SP1 Sporter.

Buy just the Buttstock for use on your Buffer Tube - or the full Assembly with all parts included.

Butt Stock is available in two versions:

  • Anodized, Grey in color. Can be used as is.. or you can Coat it yourself with the product of your choice.
  • Coated, Black.


Receiver Extension (Buffer Tubes) are available in two versions:

  • 2-Position (Mil Spec)
  • 4 Position (Mil Spec Genuine)
  • 6 Position (Mil Spec)

Made in USA


  • The first few collapsing Buttstock examples were handmade prototypes and somewhat complicated in design.
  • This was eventually replaced in 1966 with a much simpler sliding stock design made of aluminum - this is the product you are looking at now.
  • Eventually the above Aluminum stock was replaced by a same shaped version in much lighter polymer (Here)
  • This design was then used up until replacement by the M4 version, which introduced the stock design still used today.



  • 5

    Posted by Jeffrey on 21st Apr 2020

    Perfect for my retro commando colt build

  • 5
    rubber coated Type 2 stock

    Posted by Mike Moore on 9th Aug 2019

    Worth the wait. I was very pleased to open the package and see the quality of this product. I have several original Colt rubber coated aluminum stocks and this is spot on. Definitely a must for building retro clones. Too bad places like Brownells do not source these stocks for their retro guns instead of using the plastic/fiberlite type 3 stocks...I know, its the price point but if you have the money to build a retro clone, what is the point if you are not trying to make it as authentic as possible minus the select fire lower.

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