It’s possible small arms fire doesn’t make big enough shockwaves. To cause the effects. I’d hypothesize it’s the larger blasts… perhaps even a frequency component to it? Blasts from a fast explosive like C4 could do more damage than slower shockwaves like mortar or artillery shots.

Idk. Interesting subject.

To someone familiar with the subject matter, “shooting guns gives you brain damage” is an absurd, incorrect idea that one feels obligated to voice an objection to, in order to perhaps slow the spread of misinformation.