Quote - "The Hi-Power 9mm" (around 1924 when he was getting on a bit) and still in service in the UK. The double action was and still is "an ingenious solution to a non-existent problem"
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The Browning Hi-Power, as issued during the war, is not double-action. First round must be cocked then all the rest are automatic.
FN much later, around the 80's I think, did revamp it to double-action but I don't think it was a commercial success.