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Telescoping Stock

Parts needed:

  • A takedown pin
  • A takedown pin spring
  • A takedown pin detent
  • A telescoping stock
  • A buffer extension
  • A backplate
  • A locking ring
  • A retainer
  • A retainer spring
  • A buffer spring
  • A buffer

Tools needed:

  • Telescoping stock wrench


  1. Insert the retainer spring and the retainer into the recess in the lower.
  2. Install the buffer tube, the backplate, and the locking ring onto the receiver and depress the retainer when necessary to get it to rest under the extension tube. (Turn tube until it is about 1/4 turn past the correct location.)
  3. Install the takedown pin with a groove to the rear and install the detent and spring from the rear of the receiver.
  4. The backplate will now hold the spring in place when you turn the extension tube back 1/4 turn.
  5. Tighten the locking ring using the telescoping stock wrench.
  6. Insert the buffer spring and buffer (with the hammer down) into the buffer tube until the retainer snaps up to lock it in place.

Ask Yourself: Does the takedown pin, stock, and buffer retainer function properly?

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80 Lowers, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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