Jaybird1980
Grandmaster
With the oil filter adapters, Bubba shoots it a few times and giggles at thinking he's doing something no one else has thought of, then trashes the used filter and keeps a few unmodified filters around "just in case." But the ones I've been seeing are something Bubba will keep around because hey, it's a nice suppressor and why should he pay $500 for something that he can legally buy for a hundred bucks and is easy to make work. And someone who knows Bubba has it, like an angry ex, tells the law and suddenly Bubba is a felon. All because "they couldn't sell it if it wasn't legal." Even better is when the BATFE decides the company is selling suppressors and seizes the business records and Bubba is now in their sights.
I've only ever heard of the oil filter ones, I'm not on FB.