Create sensible, balanced firearms legislation that is actually meant to decreased violence

Design firearms regulations actually meant to decrease gun violence.
1. Create a system to allow medical professionals to exchange information in a database with law enforcement for individuals with mental illness or psychiatric conditions that make them a danger to self or others.
2. Create a system accessible by all firearms sellers to run background checks before selling a firearm (even non FFL dealers).
3. Repeal current firearms legislation that restricts weapons primarily based on "features", weapon color (black=evil), or how often it is in a video game or Hollywood movie (several current laws).
4. Create new legislation targeted at weapons that criminals actually use (ex: low end, inexpensive, high capacity handguns).
5. Mandate proof of firearms safety training to own a gun.