Can you provide any public records, or news reports pertaining to what happened to BOA? I get the suspicion that a lot of the ATF's actions are being misrepresented in discussions like this.
I know the ATF has sent threatening letters to paintball manufacturers in the past.
I know that when asked of their opinion, they have claimed just about anything to be a silencer/suppressor.
I don't feel it is generally a good idea to consider ATF actions pertaining specifically to firearms (accidental full auto AR-15, Airsoft AR-15 Lower Receivers, etc) without fully exploring the details of those cases, or enforcement actions so, we should stick to what we know about the intersection of paintball and the ATF.