A strange shadow/effect is 'cast' by the CZ rifle. It appears as 2 sets of 2 triangles, slightly overlapping each other (see screenshot). The shadows can be seen through the wall of a building the rifle is in and it follows a player holding the rifle and moving. IT isn't 'cast' on the ground like a proper shadow when following a player, but appears to be floating after them.

In this example look under the windows on the bottom floor. I knew the CZ was inside before I opened the door. http://steamcommunity.com/sharedfiles/filedetails/?id=291997683