There was only one other guy that I recall who was selling carbines and parts during the "Bud" era. Maybe he wasn't the only other guy; maybe it was the circumstances that makes this guy memorable.
He was a heavy guy that ran a table with who I assume was his wife. He was always wore a navy blue tee shirt. He had an IP on the bench and I rolled it upright on the table to take a closer look at the roll stamp. Darn, that guy practically chewed my head off - "You know what that is?" he shouted at me. I told him I did and apologized. He continued to cuss me and embarrassed the heck out of me.
I know about show etiquette.....didn't see a "do not touch" sign anywhere. I never had a seller treat me that way up until then or since.