Problem with all the M16/AR15 series is that they were never intended to be used to "kill" the weapon is designed and classed as a suppressant weapon. The caliber is either the .556 or remington 226 rounds, Just slightly larger than a .22lr with a lot more punch. The actual round is meant to enter the body than bounce throughout the body from bone to bone. causing eternal rips and tears of the organs. You would probably have to empty third to half a magazine to take down a single zombie.
I would assume to reliably take out a single zombie you would want at the very least 9mm and even this might not be enough. It takes an average of 3 9mm rounds 2 to the chest one in the head to kill a human dead on the spot.
Personally I'd go for expansive but consolidated rounds of Winchester .45cal
Main weapon: H&K MP5 .45 cal Very rare in the USA($$$20k+)
Side Arm: Glock-22 .45 cal police issue for larger mags
Combo'd with some sort of sword preferably a katana and a large hunting knife and a wooden baseball bat.
But a more realistic could be
Main weapon: Standard H&K MP5 9mm
Side Arm: Any 9mm pistol
Start saving for ammo now 5-10$$ a box of 50 rounds for either 9mm or .45cal. One box a month until 2012 will take u places.[/quote]
Dasvaa you just said same thing I just said cept I gave two versions and one of them having more kick.