The Z arm did not come in until the 70s, and that was primarily for the light recce militia.
The M31 mount could be used for either the M1919 or the M2HB. They were still kicking around in units long after the Jeeps left the service until the units would either turn them in or throw them away. I never saw one actually installed in a Cdn Jeep while still in service, although I'm sure someone somewhere likely did. Pretty sure trying to use one in Manitoba from late October to about sometime in April woudl result in very severe frostbite to the operator.
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