So at the range, I pretty much saw this:
https://www.youtube.com/watch?v=NPo1DzMq538
Scoped Mosin carbine in Archangel stock, muzzle brake, rail with scope, fully sick (though nice guy, chatted for a bit). Anyway using the same everything, almost as if this was the instructional video for the person. Thing is, it happened on the next bench to mine and the head of the little bolt holding the muzzle brake (clamp) landed on my bench, arms length from my face.
Now, I do wear safety glasses when I am not sure, for example new milsurp purchase/test... But never because someone next to me is doing the same. Lesson learned. Inspect clown to the left of me, inspect joker to the right and pop me ol` shooting glasses on if unsure.