Again you are describing a mental problem. Maybe we should disarm
Hollywood. If you think it is a gun problem, any box fed SA is pretty
much like any other. They pretty much all take hi cap magazines.
OTOH people have caused plenty of damage with less capable fire arms.
The guy who shot up the Navy Yard used a pump shotgun. Ft Hood was a
handgun.
Why are the AR-15 style rifles the most popular weapon being sold in the
USA today?
Many reasons, but one is that for a high-powered easy to customize
semi-auto rifle that shoots a high speed round, they are...cheap when
new and even cheaper used, and in many states you can buy one privately
without any background check.