You've missed the point.
If you've had the gun "fingerprinted". Now they know you have a gun.
They don't really care if you change the fingerprint.
PC:
"You've missed the point. If you've had the gun "fingerprinted". Now they know you have a gun. They don't really care if you change the fingerprint." I didn't miss that point, but it bears elaboration. 'Ballistic fingerprinting' is a reasonable-sounding (to the sheeple) synonym for national gun registration.
"A pile of sh*t, by another name, smells yet as foul...."