Like this. Was taken on Sunday with the go pro mounted to my barrel. Didn't affect the camera it's was in its case. Have actually game footage if you wanna see it
They're bullet proof inside the case. Had direct hits to my GoPro without taking any damage at all - just rinse the paint off under water and you're good to go.
I used the handlebar mount for mine as well, but they're a bit bulky - best barrel mount for GoPros is this one: