Anyone who uses a knife for a personal defense weapon, especially something as big as a kabar, had better be VERY well trained. I am a certified martial arts instructor, and taught combatives as a civilian and in the Army. A person weilding a knife can be quite deadly indeed, but only if you get real close, and can put it in the right spot (ie: groin or throat). Tasers are nice : ) They make you happy until you miss! Then you are screwed. Knives, tasers, golf clubs, baseball bats, and umbrellas are home defense weapons for people who live in fantasy worlds, or England. I would love to see the look on some retardes face when he gets shot by a criminal in his home, because he brought a knife to a gun fight. As far as 5.56mm penetration goes, big misnomer. Yeah the M855 green tip ball will drive through a dozen walls, or whatever. But a good HP round pushing 3k ft per second, will produce far less penetration than even buckshot, or a .45cal FMJ slug. WEIGHT is the biggest factor in soft tissue penetration. A bullet that weighs 135g to 240g will blast through far more house walls than a flimsy little 62g HP.