In third person view when prone on the very top roof of a fire station, if you lay next to the low wall and turn character your moisin turn towards the low wall, your tip of your gun will go straight through the wall. So there is no collision with gun tip or it is clipping through the wall (sorry can't remember which one it is classed as.)

If you look through first person view doing this issue the gun barrel looks like it has been shrunk or squashed, it might just be me thinking it looks like that, have a look and see what you think for yourself.

I have only tried this with a moisin equipped in hands. I have a M4 and a FNX45 aswell so will try with them. Will bug if same happens. :)

Have uploaded a screenshot in third person and first person views.

This is on stable build 0.33.114926 {F30073} {F30074} {F30075}