Here's a recoilless casing that took some work to identify on the IAA page, so those of you from the IAA need to let these guys take a stab at it. BOCN, no peeking at the IAA page (at least for this, though there's Great info there to be had otherwise)!!! It is next to a 105mm and a 106mm recoilless for size comparison.
All Ordnance from my collection that I post is Inert.
All Ordnance from my collection that I post is Inert.