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US made barrel nut which may or may not be considered a 922r part, but in case it is ever questioned then you are covered.The size of this part was taken from a Romanian underfolder parts kit and looks very close to a Russian nut off of a milled front end. Threads are 14-1 left hand. 0.56" long / 0.3 oz.
This item is made in the United States and counts as a 922r compliant part.