No2..
is, I think, a twin 6 pounder - this was an eary war attempt to produce a medium AA gun (light AA covered low-flyers and heavy covered the high flyer - something was needed to cover the gap)
They were developed from the 6pdr coast artilery and had a twin mounting on a three wheeled carriage. The main problem it seems was in developing an auto loader and, by the time a practical system was ready, Allied air superiority removed the need for it.
Info courtesy of "Artliiery" by Batchelor & Hogg
Noel
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