"the DC sniper used one."
That's because snipers are the epitome of spray from the hip.
A 9mm bullet is instantly more deadly and super-powered when fired from a mac-10 assault rifle (call me weird, but that doesn't look much like a rifle to me).
I never realized that AK47's and M16's were developed during WWI and could magically shoot the enemy in another trench while the shooter stood in his trench and randomly sprayed bullets from his hip.
I think she talked me into getting an assault rifle by describing their magical physics defying abilities.
If any of you with a few dozen extra in the gun safes (you know who you are) would like to donate one of these to me, I'm willing to remove it's evilness from your presence.