The atf showed up to his clients home for a rare breed trigger he bought on gun broker with copies of the emails exchanged from gun broker in hand. It seems they are going after individuals now, just watch your back, cross the wrong atf agent and you’ll spend the next few years in court. Personally I doubt they will be able to get convictions(contrary to popular believe the atf loses in court more often than it wins on issues such as these involving their interpretations on laws) but they can cost you a fortune doing it.