[offsides]

Given that the attack strength is generally a linear scale, I can't see any weapon greater than A1 being AP only. That is, any weapon that can do A2 MUST be effective against more than just INF, because to do A2 it has to be powerful enough to be able to. Multiple A1 weapons combining to do A2+ while retaining the AP only limitation makes sense, but A2 AP only doesn't really make sense to me.