Forgot to mention...
If you'd like to see some of the commonly used forms, go to
www.titleii.com
The Form 1 is used to make a new NFA weapon (except MG's, which can only be made by a licensed 07/SOT manufacturer)
The Form 4 is used to transfer an existing NFA weapon to an individual.
The Form 5320.20 is used to transport an NFA weapon across state lines (not required for supressors, but recommended)