Originally Posted by
lonestardiver
Look on the form 1 under change of description. If you sell or trade or no longer have the original upper and you are using one of a different caliber or length you are making a permanent change. If you keep the original and swap out uppers as desired but have the ability to revert back to the “dimensions” as noted on the form 1 then everything is OK. I believe the ATF wants to know of “permanent” changes to a registered NFA firearm.
Item 4 is the description with parts a-i. Those include caliber, barrel length, etc.
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