Other than the two automatic versions of the 6pdr (one for MGBs with 6 shots and one for the Mosquito Tsetse with 21) there was also the 17pdr Mk.III for landing craft, a 20pdr for the Brave class MGBs that proved to be to heavy and a 32pdr for Tsetse. Does anyone have any information on the exact nature of these other guns or any other attempts to make automatic artillery?