how to list size for nfa short barrels on a form 1

Hey everyone!

On the NFA form 1, can you list the length of your rifle barrel as "less than 16 inches" so as to avoid amending the form should you start out with a 14.5" and later decide to go with a 7.5"?

Do you have to list the actual length as a set number (14.5" or 7.5") and amend the form every time you swap to a different upper?

You only have to ammend permament changes to the barrel length.

Listed as 14.5"

I just got my approval back in the mail!!!! Pictures to come soon...