This should be null and void. This is strictly a matter of operator error. Once again it's not the gun's fault. It did nothing wrong. If you can't rack the slide all the way back and check the chamber to verify that it's unloaded.. as is instructed by the owners manual and common sense in safe gunhandling, then you shouldn't be holding a gun to start with.
It's always some goober's fault. Gun's don't just "go off." Someone loads them.. cocks them...puts them in an unsafe position and then they don't point it in a safe direction etc.. yet everyone wants to blame the gun. What's up? .. I mean really..
Relax Hawkfish, It was not a slam at Glocks, I've been bit by similar things at work, Stop in the middle of the run, take the fixture out, flip it over spin it around a couple times while taking some measurements turn it BACK over ,put it back in the machine. Fixture goes in fine left to right or right to left, But it only makes GOOD parts one way, if some one asked a question or you got distracted some other way you may scrap a whole load of parts.
One second of carelessness / distraction leaves round in the chamber, on a 1911 you get it apart and say "HOLY CRAP THERE'S A ROUND STILL IN IT" because there is no point where you are required to pull the trigger, personally I always take the mag out first, jack the slide to eject chambered round, visually check the chamber, then do it again, and after years of broken tooling, if I do not specifically remember checking 2 times, I check again,

The simple fact is that a Glock is NOT a 1911 and with an action that requires pulling the trigger to disassemble ( Like my old bolt action Mossberg shot gun or many bolt action rifles) that one careless second MUST not occur when you are clearing the chamber.