Something put him on their radar screen, likely Federal. The partial surrender probably also played a role. If parts of H.4139 pass, there will be no grace period if your LTC expires. Technically, this means you need to surrender your firearms, mags and ammo until they give you your renewal. If you have anything unregistered or not legal for you to possess, you are getting revoked and charged.
There definitely seems to be a larger crackdown going on around ‘homemade’ silencers - people are ordering solvent traps, mfg them into suppressors and Form 1’ing them. Seems the ATF doesn’t like that even in the 42 states where they are legal and they get their $200. Even though they are NFA, the burden for suppressors is lower than SBR’s. You can take them out of state without paperwork, for example. It is hilarious that Campbell mentions silencers because they aren’t legal to possess here unless you are an 07/02 or on duty LEO, so what are you going after? Are they suddenly finding them at crime scenes every night in Roxbury? You couldnt Form 1 one here because they are still illegal. SBR’s different story as long as they are AWB compliant (or you are exempt).