Altering form 1 info

[rjv140]

I have just received my form 1 approval. When it was submitted for approval I intended on using a 8.2 noveske barrel, however, I ended up using a 8.5 inch barrel. My approved form 1 lists a 8.2 inch barrel with an oal of 27.2.

Am I required to notify the ATF of this change?

 

[Sharkbite]

Technically, any permanent change to the approved gun needs to be changed. In reality nobody is going to notice 3/10 of an inch