Castle Nut
Castle Nut
Manufacture ID: 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.
Manufacture ID: 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.
