BlkHawk73 - Because your shot gun is an NFA firearm, you must still keep a copy of your Form 4 with you. The BATF regs. state that once a firearm's serial number has been registered NFA, it is forever NFA even with a legal length barrel. You're allowed to change barrels, (e.g. 12" barrel to 24" barrel) but you must still carry your paperwork.
Hope this clarifies things.
~Blades~
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