-Go near the Gastank on the NorthWestAirfield by the central industrial compound as if there was someone shooting at you from the top of the firestation.
-Shoot with an M4 (all Magpul oarts in my case) at the top of the firestation tower from right behind that gastank. You will notice that all bullets were eaten by the gastank, even though the tip of the rifle was way above the gastank.
Thats the last intance i had this, it happened on multiple others too, for instance at land_shed_w02 here http://dayzdb.com/map/chernarusplus#7.038.065 in Vybor or Barrack2 at http://dayzdb.com/map/chernarusplus#7.041.046 near the door. Imagine you want to use the door as cover from enemies at the north. Its impossible to shoot past the door.