Why do you think it was a handgun?
How is a handgun more deadly that a rifle? Or a car?
I didn’t say that I thought he used a handgun. The question I was responding to asked about a 21 year age limit. The only such limit that I’m familiar with is the federal handgun requirement. While some states could have that age restriction on long guns as well, I don’t know of any.
So far, I haven’t seen any information released on the number or type of the guns he used.