In this particular instance, the “gun crime” was his possessing a 38 caliber pistol with a barrel under 100mm (~4”) long. This is a prohibited weapon, in the same category as machine guns and select-fire weapons. Really.
Ref: Dr. Ferris’ speech in Atlas Shrugged.
Somehow a snub nose pistol doesn’t create in me the fear, panic, and distress from which this sorry excuse for a judge suffers.