Actually the Glocks did fire 100%. If anyone wants some facts, read the book "Glock - The new wave in combat handguns" by Peter Alan Kasler. He documents the entire history from the Austrian Army's call for such a gun and Gaston Glock having never built a firearm before this, to dropping the Glock 60 stories from a helicopter, field stripping it, then firing 1000 rounds through it with no failures (I believe as it's been a long time since I read it). The gun sat in sal####er for a week, was frozen, did the sand test, all that schtuff.
He also reports on the politics on how the gun received some bad press in the mid 80's. Coverage of the function of the gun is exceptional. He is/was a Glock armourer. He also explains the Glock phenomenon, and why the CHP didn't end up with it......but nearly everyone else did. Very good read.
http://www.amazon.com/Glock-New-Wave-Combat-Handguns/dp/0873646495