Able to reproduce consistently on ZGM 16+2 Master Altis (NATO). Strangely enough, aiming down the sights works perfectly for me in ZGM 48+2 Master Altis.
May 10 2016
You can actually place a cycle waypoint now by holding down ctrl+alt when you place your last waypoint on a patrol cycle. I make use of this extensively when I play as Zeus.
The Merkava Mk.4 has a 120mm main gun.
I've experienced this as well in the latest stable build.
May 9 2016
How is this a bug? Are you telling me you don't want horrible nightmare snakes pursuing you even into the man-made structures you foolishly think will keep you safe? How naive. THERE IS NO ESCAPE FROM HELLSNAKE.