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Receiver Extension Castle Nut

June 4, 2020
The buffer tube castle nut is a notched circular nut that screws onto carbine buffer tubes. It is designed to keep carbine buffer tubes secure to the lower receiver.
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Castle Nut

The castle nut is a screw-like component located secures the end plate and buffer tube to the lower receiver. It gets its name from its notched perimeter, which requires a corresponding wrench for tightening or loosening.

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