The excellent Mr. Bergman recently released the Centaur IV AA tank, mounting a pair of 20mm Polsten cannon, in 1:100 scale (15mm).
It was not as common in action as the Crusader version, which mounted the heavier 40mm Bofors, but there were a few of them in Normandy. Neither version was much used in its intended role, as the Luftwaffe was not in much evidence in the skies over D-Day and after, but they were very effective at engaging ground targets.
I've shown it here with a few PSC plastic 15mm British paratroops. I haven't yet supplied the vehicle with any crewmen; I'll get around to that one of these days. I printed it on my Ender 3 in eSun PLA+ — the layer lines are much more evident on the turret than they were on my Cromwells, due to all the sloping panels. Nevertheless it will do well enough for a gaming model.