I was thinking about how fire guns are very loud and how its worst in close environments (I had never shot a gun cuz im not american) and I remembered the Mirror room scene in John Wick Chapter 2.
I was thinking if by shooting once, many mirror could break because of the sounds of a gun alone. Has someone tried this or see it happen?
Well, my military experience says glass can feel safe from regular gun sounds.
We were using H&K AG3 with 7.62mm ammo, which is pretty strong as guns go. Both outdoor and indoor ranges. Bottles, windows, my glasses, windshields, mirrors, never had anything crack.
So it would have to be a very constructed setup and very brittle glass for it to break glass.