It was when I had my FFL, I lost it about 8 years ago. I still managed to under price most of my competition, especially on AR-15'sI would doubt that persons advice and interpretation. For any everyday Joe it is illegal to assemble a firearm with the intent to sell. At the very least, your employees would be on the hook for doing so.. and you as well if they were doing it under your direction.
I would think.
& that ATF employee whose advice you would doubt used to come by once a year & check out all of my records, take them back to the ATF lair & likely copy them all