''There are plenty of NRA members AND gun owners who will gladly support UBC and "assault weapon" bans as they think it won't affect them.''
And they are just as correct as they are short sighted. It will NOT effect them.
For now.
Then later, WHEN the law or edict fails, not if, plan B of the original proposal comes out of the desk. And if necessary, plans C, D, etc.
Until confiscation happens, then total subjugation i.e. circa 1650BC ( in sig. line, below).