[I could not copy 'n paste from my link because it had too many charts and data that would could not be copied]
In any event, I have always believed that legislation alone, cannot fix a problem. For years, we thought we could punish our way out of the drug problem through draconian mandatory minimum sentences, -- a path that failed miserably. Crime is best prevented via upstream investment and intervention.
Re mass shootings, gun control legislation cannot fix the problem, but it can help mitigate the extent of the problem. What I believe Congress should do:
Minimum age 21 to buy a firearm or ammunition [18-20 year olds make up 4% of population, yet are responsible for 17% of murders]
Anyone under age 21 cannot possess a firearm unless under the supervision of someone 21 years or older.
Universal background checks for anyone buying a firearm or ammunition, including gun show purchases. Add in red flag prohibitions.
Required license to purchase a firearm, which would include a certified gun safety course. We require a license to drive a boat or car, get married, etc. [Massachusetts requires a license to buy a firearm, and enjoys lowest gun mortality rate in the nation]
Create a national federal database for all gun sales
Mandatory 30 days waiting period for 1st time purchaser
Remove civil immunity for firearm manufacturers
Ban ghost guns
Ban AR-15 type weapons, including possession. Government will pay $1500 compensation per weapon surrendered.
At a minimum, ban the ability to modify semi-automatic weapons to fire on automatic.
Outlaw bump stocks
Outlaw high capacity magazines (no more than 7 rounds)