Bruel,
My buddy's video shows similar results with certain loads, though I had not seen them myself (as far as the head rest stopping shots from the rear). Most of the shooting I've done with 9mm was using a +P or +P+ rated round.
Noel also brings up a good point about Buck shot not being spectacular against vehicles and many LEA's only allow their officers to carry buckshot and certainly most shotguns loaded for LE or defense purposes today are loaded with buckshot with the slugs possibly being kept nearby.
Also, performance of the handgun rounds will be improved at least a little by the increased muzzle velocity from the carbine.
Let me put it this way, I'm not advocating the use of *any* handgun round when it comes to stopping someone that is in a vehicle if there is an option to be armed ahead of time with a rifle or slug-gun..but I am also not going to feel at all safe sitting inside of a car if my attacker "only" has a 9mm.
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-Essayons
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