He appears to be in Maine because he has asked about public places to shoot here. He says he cannot get a permit for a cartridge gun (odd, because one doesn't need a permit in Maine), and says he won't elaborate on his circumstances. It leads us to believe he is (for whatever reason) a prohibited person. In Maine, even BP guns are firearms under the legal definition of restricted weapons.
It is possible he's legally a resident of another state where a permit is required, and not a resident of Maine, but he's not saying.