You don't have a problem with "undocumented" illegals, why do you have a problem with undocumented gun owners, or undocumented anything else for that matter?
To the contrary, I have lots of problems with people coming into and living in America illegally. Where you and I part ways is I don’t support ineffective and stupid policies.
If you want know what actually needs to be done to dramatically lessen illegal residents in this country go ahead and ask.