I am no expert when it comes to gun smithing, but as I hear Mike Krause tell it to me, the short frame was easier to thread in the barrel and have it line up properly with the correct configuration. With the long frame, more laborious steps were required. It apparently had nothing to do with the change of shape of the shell casing from 7.65 to 9mm. It also had nothing to do with making the pistol lighter. There had to be a practical reason for this as the long frame never returned (except for certain contract pieces) after 1914.
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