How would that work anyway? It's not something someone would notice you disabling when you go to the range, unlike full auto/DIAS conversions and short barrels where someone might notice, you literally can't notice unless you have an ultrasonic detector. Are there going to be ATF agents hanging out at ranges trying to see loose wires hanging out of people's guns or guns that don't produce ultrasonic noises when fired? I assume that's not going to happen. Anyway, it's not legal to ban guns without the ultrasonic speakers anyway, because there's no way the military is going to have ones that can't be turned of on their guns. No historical precedent for anything like that either, and ~all of current guns don't have ultrasonic speakers on them, so the Heller "common use" thing is there as well.