most of the point of the NFA registry is to track NFA items, not do background checks on buyers... up to a few years ago, the only background check being done was by NICS at time of pickup.
after this experience, I would be very leery of paying big bucks for a machine gun because apparently you can submit the same NFA item multiple times and nobody notices which I am very unclear on how that could happen. I have had ATF call me to clarify barrel lengths, I guess who or how many not as important. Unless machine guns get more scrutiny than cans. But end of day, if there is fraud its pretty clear nobody cares.
after this experience, I would be very leery of paying big bucks for a machine gun because apparently you can submit the same NFA item multiple times and nobody notices which I am very unclear on how that could happen. I have had ATF call me to clarify barrel lengths, I guess who or how many not as important. Unless machine guns get more scrutiny than cans. But end of day, if there is fraud its pretty clear nobody cares.