Just throwing this out there.
Our public range and the PD range basically share a single fenced in facility.
All local, state and fed LE drives right past the firing line to get to their section.
All I've ever seen is "smile and wave" as bump stock (maybe actual FA, I don't really look at them either) dirt clod shooters burn through cases of ammunition.
Same with suppressors and SBR's even before the proliferation of braced AR pistols.
I've never seen a single concerned inquiry as to their legality.
In free parts of the country nobody gives a shit about what guns you own (and openly shoot) unless they're used in an actual criminal act.