Shooting Past Tanks When Your Barrel is Sticking Through Them.

Lert: Because of latency between your client and the server.   Also, a shot comes out of the gun mantlet, not the end of the barrel. If a target was stationary and you put a gun through him, the muzzle sticking out the other side, your shot would hit the tank. You missing in this case is a function of latency.   Try playing with server reticle. This shows where the server believes your gun to be aiming post-latency, rather than your visual model on-screen pre-latency.