If they know you have a gun and have refused to turn it in, they will freeze your accounts, suspend your driver’s license, and start the process of removing your kids from your home. They will shut off your internet and cell phone as well. And they can do this without ever ringing your doorbell
Yes, and shut off your utilities, put you on the no-fly list and audit you both federal and state. In no time at all you’re reduced to a state of nature...or you’re in prison or the psych ward. In any case just one medical emergency away from annihilation.
No registration in most states.
They don’t know who has what.