If I may - I was always thinking that mortar and AOP carriers were not using firing rests at all, no matter of the Mark.
Obviously not true - please see attached picture of british made Mk.1 3inch mortar. I believe this is the variant Lynn is talking about - firing rests mounted outside. However what I still think is that Mk.II variants of mortar carriers and Mk.III AOP carriers have no firing rests - rolled steel (I mean british made at least but possibly also *).
__________________
UCw Mk.III
|