Say I get my tax stamp for my SBR Imi Uzi. It's listed on my form as a 9mm. Then later on I decide to get a 45acp kit from a vender with a 10.25 barrel am I out of compliance being that on my form it's only listed as a 9mm. :uzi
Doesn't matter what the Form 1 says ATF requests you update them of the new configuration if there is a permanent change but it's not required, same deal with barrel length and caliber.