Tonight we were playing WWII regiment (2.1). Our infantry platoon was being supported by a Sherman tank, under the instructions of our Officer player. At one point, we squared off against a Panzer IV, and the anti-vehicle weapons were duly consulted.
It seems that medium tanks can't hurt one another on the front armor. 7d AP against armor 8 seems destined to do no damage. We struggled with this for a while until deciding that some tank fire might be concentrated.
I'm not sure how a single-shot weapon becomes concentrated, I think it may have to do with aiming time. (e.g. if you're hull down and stationary and a guy comes through a narrow defile, you'd be shooting concentrated).
Curious how this is usually handled. (Maybe it's not, being an NPC-on-NPC action?)