A $200 tax on any kind of firearm still sounds like a lot to me and, anyway, the price itself of most firearms is prohibitive to a lot of people, believe it or not. But in the case of your right to "Life, liberty, and pursuit of happiness," the writers of those documents hardly believed it applied to everyone in the first place. So a poll tax is not an issue if you don't otherwise qualify to vote.
Our forefathers had a highly developed sense of how to make things work so that whatever they may have written made no difference one way or the other. It's not exactly a lost art, either. There's a lot of talk about illegal immigrants nowadays. Go see if you can figure out when Indians could call themselves Americans.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.