No not "frowned upon"... specifically prohibited in the rules.
CORRECT. The Forum does not need somebody prohibited from possession of "ammunition components" or some bad actor bent on a terror act, acquiring components for a "device" or learning how to fashion components to create such a device, by participation here. Since we have no real way of knowing who might be such a person, we cannot screen them out, BUT we can stop public discussion and sales here.
What folks do in a private setting is... private.
LD