The Glock is an extremely safe gun and simply cannot fire unless the trigger is fully squeezed. Yet, there are always comments about the Glock and its lack of a "safety." I don't understand this need to lock the trigger. Personally, I think external switch safeties are extremely dangerous. There are too many videos, on those reality shows, of store owners being shot because they couldn't shoot first (had the safety on.) And every once-in-a-while you get a gun that discharges when you release the safety. That's not very safe. Glock got it right. If there is a finger squeezing the trigger, then someone *must want* the gun to go off. That's how they designed the gun. If you don't want the gun to go off, don't squeeze the trigger. And if there are little fingers on the trigger....well, that's a whole different problem, and one that a switch safety will solve for only 5 seconds. The grip safety is a good system. However, that safety is turned off when you grip the gun. With a Glock, all safeties are active until you start to turn them off, one by one, by squeezing the trigger. So why would anyone want another safety?