I find this assertion to be highly questionable. Anybody from MA care to check in on this?
Oh, and while I'm here...FUDM and the horse you rose in on, too!!
Which part do you find incredible, the ban, or the crime statistics?
Homicides continue to fall pretty much everywhere. Semi automatic rifles are used in a tiny fraction of homicides, and so I doubt an assault weapon ban could possibly have anything to do with it.
I'm going shooting with my daughter tomorrow.