I'm going to put this link here, and then give a very, very brief summary.
What an AR-15 Can Do to the Human Body
I've seen so many arguments out there about how the AR-15 isn't all that more deadly than a handgun or other rifle. But, this article makes a couple of points that you will rarely see addressed.
1) The bullet shot by an AR-15 leaves the barrel at 3x the speed of a bullet shot from a handgun (even semi-auto). While the bullet of a handgun could potentially get stopped by a larger bone in the body, or just lodge itself and not come out the other side, this high speed can cause it to ricochet round inside the body or go tearing out through the other side and into another person. The doctor in this article points out that a person surviving a handgun shot will more than likely only need one surgery to treat, the survivor of an AR-15 shot would need 3-10 surgeries!! I mean, how is this for a description of what it can do:
"It has so much energy that it can disintegrate three inches of leg bone. 'It would just turn it to dust,' says Donald Jenkins,
a trauma surgeon at University of Texas Health Science Center at San
Antonio. If it hits the liver, 'the liver looks like a jello mold that’s
been dropped on the floor.' And the exit wound can be a nasty, jagged
hole the size of an orange."
"The bullet from an AR-15 might miss the femoral artery in the leg, but
cavitation may burst the artery anyway, causing death by blood loss."
2) Unlike handguns and other rifles, the AR-15 doesn't have a whole lot of kick. The kick of the gun is what makes even a semi-auto handgun more difficult to rapid fire, because it takes the user a second to re-grip and what not. Because of the lack of kick in the AR-15, a shooter can just sit there and wail on that trigger as fast as they can. If they are really good, they can fire close to auto speeds, or if they install something called a "bump stock". It doesn't take a rocket scientist to figure out if you can get shots off quicker, you can do more damage.
Don't let the pro-gun folks lie to you! They will say, "But I have a semi-auto handgun...should that be banned, too?" Or they will say, "A .308 caliber will do more damage." They will never address the real reasons why the AR-15 is such a dangerous weapon that needs to be taken off of the streets!