Skink - 20mm Flak Sherman
Canadian military came up with a system that effectively put four 20 mm auto-loading cannons into the turret of a tank. It was known as the Skink. As the marriage of two off-the-shelf technologies- the M4A1 Grizzly tank (a Canadian version of the Sherman tank) and the Polsten automatic cannon, the Skink was a weapon system that saw little action but was a superb proof of concept.
This is a companion discussion topic for the original entry at https://ww2incolor.com/gallery/canadian-forces/35691/skink-20mm-flak-sherman