data on drop testing: (or the frisbee test)
the firing pin is held back by the sear, or catch. the only way for the firing pin to come forward is for the sear to fall down. the drop safety's specific purpose is to guarantee that the only way the sear can fall down off of the post is if the trigger and only the trigger moves backwards.
glocks have one additonal safety called a plunger safety. my understanding of this device is that it blocks the firing pin channel and thus the firing pin from moving forward even if the sear does manage to disengage. it is overcome when you pull the trigger.
steyr elected to have the firing pin spring preloaded at 72% instead of glock's 50%. 72% is kind of a weird number to pick arbitrarily in my opinion. i have heard that the reason steyr picked 72% is because it was the greatest possible amount of precock that can be released and not detonate a primer. once again confirming that it truly is a double action and requires that the striker be pulled back during the trigger pull for a round to fire, cornbread.
so far as i can see the only way you could drop the gun and make it go boom is if it landed with a stick in the trigger guard that had enough force to push the trigger backwards. good luck!
although i heard glock actually failed a frisbee test in the early nineties?
incidentally, i've been told by a very reliable source that if your were to take the slide off of your gun, chamber a round and drop the slide directly on its muzzle from about 6 feet onto a hard surface, the firing pin could build enough inertia to detonate a primer and it would go off. so don't do that.
and don't hit .22 short rifle blanks with a ball peen hammer either!!! they go boom!!