It is interesting to me that right in their own article they point out the fact that
"Fewer than a quarter of guns used in crimes come from Massachusetts retail sales, he said. The rest are illegal or come from out of state", yet they want to ban the people from making LEGAL purchases.
"Weapons like the AR-15 are the gun of choice for mass shooters, Healey said, used in shootings in Orlando, Baton Rouge, Dallas, Sandy Hook and San Bernardino" It's also interesting that they only have five examples to point out, but somehow that makes the AR the "weapon of choice for mass shooters.
They also conveniently leave out the fact that in at least three of their cited cases... the shooter practiced or had been a practicing moo-slim.
The only thing stopping bad guys with guns are good guys with guns.