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What is the purpose for using this part? — 2 Answers

by Ram, from TX, United States Asked on July 16, 2020

Name Aero Precision Receiver Extension Lock Nut (5)
$10.00 $8.09 Save 19%
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Answered by Kurt Colbourne, Gear Expert, from IL, United States, on May 04, 2021

The castle nut is the part that holds the carbine buffer tube to the receiver. You cannot thread the buffer tube until it is snug as that will leave the tube unbalanced. The castle nut allows for locking the tube in place as well as in the correct orientation.

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Answered by ohkarlos, member, from NV, United States, on March 28, 2021

Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock. Perfect for your new build or as a direct replacement for worn out parts.

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