Well, I know there's one less as of a week ago Friday. That's the day the Special Agent from DoJ walked into my Class III dealer and picked up the 1919A4 that I was in the process of buying. He had a letter saying it was illegally manufactured and he was seizing it. I'm now out $13,000 and will have to file a suit to recover the money I paid. The seller's attitude is "Tough. You paid me, I'm done with you." My comment - "See you in court." Which could take 5 years.
My advice on Class III purchases ... Make sure the gun is legal, no matter how many times it has been transferred before. My almost 1919 had been transferred four times since it was manufactured in 2001. The builder made 30 of them and used serial numbers off MAC-11s that he destroyed. The gun went from 9 mm to .30 cal and NO ONE at NFA caught any of the 30. Your government in action. And, yes, I have ALL the paperwork back to the first transfer.