Well... You post here. That'll get you on at least one. If you've ever given money to the NRA/GOA/SAF/SAS then you are probably on another. Tea Partier? Another... Ever been to a gun range and had to register or paid by credit card? Filled out a 4473?
Heavens forbid if the NSA computers have even flagged a phone conversation or email posting of yours. In that case, hide your dog... You'll be getting a visit.