I second that. A friend of mine was field testing one. Wasn't sure of the sight so he decided to "walk" a couple of rounds in. First round hit about 10 feet out. Scared the Bejesus out of both of us.
The next month one of the big time magazine writers described a similar event when he was testing one.
“First round hit about 10 feet out.”
Keeping your booger hook off the bang switch until your sights are on target is the rule for ANY gun. Not just Glocks. I once with a gun that had a safety. After that I was more careful. Even Glocks don’t go off if you keep your finger off the trigger.