Welcome to The Firing Line, Dieseljockey, and excellent first post.
Press charges. This guy is a menace to others and, quite possibly, himself. He needs a good legal slap-down. Think how you would feel if you picked up the papers one day and saw his mug staring back at you, and you learned he was in the dock for shooting an innocent citizen.
The speed with which he disposed of the firearm also makes me wonder if he was the legal owner . . .
"...A humble and contrite heart, O God, thou wilt not despise." Ps. li
"When law and morality contradict each other, the citizen has the cruel alternative of either losing his moral sense or losing his respect for the law." —Frederic Bastiat