The bill prohibits individuals 18 and older from providing firearms (except handguns) to juveniles for self-harm or criminal use. It also mandates storage responsibility, penalizing those who allow unauthorized access to firearms by juveniles. Penalties for violations include fines and imprisonment, varying based on the circumstance. The bill aims to reduce juvenile access to firearms for harmful purposes and hold adults accountable for negligent storage or provision of firearms to juveniles. The bill does not affect minors engaging in lawful firearm activities or an adult's responsibility for a crime committed by a minor who did not access the adult's weapon directly.