This is about the ability of a recoilless gun/rifle (RCL) to shoot through other units.
I can confirm that RCL CANNOT shoot through other units. The reasoning is that the low profile and poor set up foundation leads to poorer accuracy. Of course this can be debated, but it stops RCL being too effective as distant weapons.
RCL whether vehicle mounted or on foot cannot shoot through any other unit area.
martin :)