"Never shot anyone. Have seen many people shot. And one shot will not stop them (unless it's in the head)."

Well, I have shot people with handguns. I also worked the robbery-homicide detective squad of my state's largest law enforcement agency for years. I know firsthand that sometimes one shot stops the guy and sometimes it doesn't.

Evan Marshall and Ed Sanow's book on handgun stopping power was based on researching hundreds of police-involved shootings. They documented a large percentage of one shot stops with some handgun and cartridge combinations, some exceeding 90%.

"They might die 30 minutes after they are shot, but rarely die in the blink of an eye.."

Whether the shootee lives or dies is irrelevant to the discussion. Most people shot with handguns, probably 75%, live. Stopping the bad guy's acts is the goal, not killing him.

Also, to be more accurate, it isn't "head shots" that are the best stoppers, it is hits to the entire central nervous system, which is the brain and spinal cord. Lots of head shots aren't good stops because they don't impact the brain.

But, back to the discussion on magazine safeties...

No safety device should ever be considered as a substitute for proper gun handling.

Whether or not a magazine safety is good or bad depends on the user's totality of circumstances and personal preferences. While the handguns I carry daily don't have them, that factor wasn't part of my choice decision. If I carried a S&W autopistol so equipped, I wouldn't let it concern me much. S&W's system is pretty reliable.