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Isn't that only temporary?
What is the permanent solution for moving states?
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#NotALawyer, but my experience is with a permanent IN-STATE move. In this case, I had heard INCORRECTLY in the past that the ATF does not care. They do care. For in-state TEMPORARY moves (i.e. visiting friends, family, etc) no action is required as far as I've heard. For an in-state PERMANENT move, apparently they don't care about silencers, but SBR's and everything else they do. I actually included my silencer on the form just to be safe. This is not legal advice, but I would recommend the same - what can it hurt? I was told by a rep at the WV NFA branch that the form 5320.20 is what to use. Fill it out per the image below.
My best guess is that for a permanent out of state move, do the same thing. Also, to answer your first question, this is REQUIRED for ALL NFA items when moving permanently out of state. If you have more than 3 items, complete a new form until you have covered all items.
To summarize:
Temporary transport IN-STATE - no action
Permanent transport IN-STATE - no action for silencers, Form 5320.20 for anything else
Temporary transport OUT-OF-STATE - Form 5320.20 for all NFA items
Permanent transport OUT-OF-STATE - Form 5320.20 for all NFA items
For your other question, I'm not sure. If you don't know your new address yet, I bet they would tell you to wait until you know to send it in. However, legally you shouldn't be moving those items until that form has been approved. Therefore, my best suggestion is to contact the Martinsburg, WV ATF branch where the Form 20's are processed. Also read all instructions on the form. Their number is 1-866-662-2750 or 304-616-4130.