If you're convicted of a felony, you can't. That's federal law. If you can't purchase one legally now, you won't be able to at any other point from here on out. You can try getting your record...
If it's parole for a felony conviction, it doesn't matter how long you're off - a convicted felon is not allowed to purchase, possess, or have access to firearms. That's federal law, and is not going...
If you are truly "off" parole, meaning that you have totally completed your parole obligations, then you should be free to travel as any normal person UNLESS there are any other outstanding court...
There are a lot of dependencies. You can have it erased from your record. However in order to receive a gun license you will undergo an extensive background check that could bring up an erased...