On December 29, I submitted a form 1 application for a suppressor with a model number that included my initials, a two digit number to indicate the caliber followed by the letter A. In this format: "ABC-22-A", where ABC are my initials. I have the pdf of my submittal to prove it was submitted as I describe. I received approval notification yesterday. I just printed the approved form 1 out and noticed the ATF changed the model number to "B". WTF?!?! I was under the impression we could use any model or serial number we desire for a form 1 suppressor. I submitted an email to the "Ask the experts" section describing the situation asking for a revised form 1 to match my submission. I received no correspondence from the ATF they were going to change my model number during the process. Is this common practice by the ATF?