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Castle Nut

Posted in: Shooters Glossary
By AmDep
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Castle Nut

Castle Nut - This is a small piece on an AR-15, this threads onto the buffer tube and holds the receiver extension and lower receiver end plate in position. Many AR-15’s will have this staked securely in place so it cannot be accidentally loosened. The name likely comes from the notched and rounded look of the nut, as it resembles a medieval castle.


5 years ago
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