Safety, schmafety... the only true safety a gun has is the hand that holds it, and the mind that controls it. The Glock safety system is as good as it needs to be. If your index finger ain't where it shouldn't be, and the gun is either holstered or pointed "in a safe direction", it's safe. Beyond that, everything else is manufacturer's liability protection! If a separate manual mechanical safety is in use, there is a (perhaps critical) fraction of a second lost - for those people who don't practice. (Besides, if one is good, then two or three should be better. How about adding a biometric recognition system, and a secret password?) Pax...