Ghost guns

When Bob saw the gun buyback program, Bob saw an opportunity.
He priced out a room full of cheap used 3D printers and buckets of manufacturing resin.
Then he bought plans for a simple “ghost gun” and set the printers to rendering them around the clock.
On the last day of the buyback program, Bob showed up with a van full of the cheap printed guns.
The chief of police said “No way. Ghost guns don’t count.”
So, Bob pulled out a ghost gun from his pocket and shot the guy.
“Does that feel like it doesn’t count?” said Bob.