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Ergo 4971 Castle Nut
Ergo 4971 Castle Nut
Ergo

Ergo 4971 Castle Nut

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UPC Barcode:874748005333
Part Number:4971
Ergo Castle Nut 4971

The castle nut (also known as the stock lock ring and receiver extension nut) is used to secure the buffer tube to the lower receiver.

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