Mmmmmh have you ever noticed how much damage a 115 grain bullet can do due to its speed?
Now imagine a 200 to 300 pound moped at 30 mph going against a truck coming at 40 mph (70 MPH combined speed) if we take into account a pound is equal to 7,000 grains, we are talking 1,400,000 grains, even though the speed is much less its weight would be around 12,173 times greater, so....

I don't have a moped gun.