$3
Buttstock castle nut is designed to hold washer and buttstock tube in the adapter. Nut is torqued with special wrench. Material: steel. Tube thread standard: 1-3\16-16UN. This part allow you reliable secure buttstock tube in the adapter and also place washer or sling ring under the nut.
Nut on the tube
Nut installation with special buttstock wrench
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