I'm wanting to buy a gemtech silencer for a .22lr. I live in a free state and i would love to go the NFA route. BUT... i was an idiot teenager once upon a time and i'm curious if anyone knows what types of things preclude somone from being approved? I can buy a firearm, is it more than that? ADDENDUM: I understand what NFA items are, i understand about the tax stamps, the back ground investigations, fingerprints, photo's, signatures etc. i'm more interested in background check flags.