I've carried Glocks professionally for quite a few years and continue to carry an M27 concealed in a holster DESIGNED for this Glock. Your post tells me that you have no training in handling Glocks. You can't "brush the trigger" and cause it to go off if you carry it in a holster DESIGNED for a Glock.
Discharges have occurred mainly while people inserted an UNHOLSTERED Glock in their waistband with trigger finger in the trigger guard. There's no cure for stupidity.
Our transitional training period to Glocks were three days, including night firing. Among those having been trained specfifically for Glocks, I personally don't know of any "accidental" misfires, caused by "brushing the trigger".
This is not a flame FRiend, I encourage you to continue learning about your Glock and get some proper training by qualified Glock instructors (there are many out there) and learn to trust that M17 of yours.
In that case, I suggest you type in "Glock Accidental Discharge" in Google and see what you find.
Of course it doesn't discharge if you don't touch the trigger until you want to shoot. Duh!
My point, and a well documented one, is that the short, light Glock trigger pull and the only safety, which disengages when you touch the trigger, makes the Glock a piece that I choose not to carry.
Additionally, the idea that I'm going to burn myself (another posted it) with the ported barrel is just plain stupid. I have put thousands of rounds through it without any ill effects. And of course you wouldn't carry a gun with a ported barrel as a self defense piece. The upward muzzle flash would be self defeating after dark.
Although I am not a professional, like you, I have never had the problem mentioned by the poster. I bought my Glock in the early Nineties; it has a three-digit S/N. It performs especially well with a 124-grain FMJ ammo.
Personally, I don’t want to mess with a safety.
I need it to go BANG when I pull the trigger.
I carry a Glock 36.