I agree with mavracer, however I'll point out that there can be exceptions to any and every rule. Case in point: The early 1990s incident involving a nut with an AK vs. a USAF Security Forces member, who was armed only with a 9mm Beretta. The aforementioned lunatic had been gleefully engaging in mass murder at a military base when he was intercepted by the SF man. From a distance of about 70 yards, the SF man used his issued M9 to cut down his rifle-armed adversary, who was actively shooting at him at the time. The good guy survived unscathed, the murderer was not so lucky.
Seen on a bumper sticker: "Exercise. Eat right. Take vitamins. Die anyway."