Hi,
John Walter in 'The Luger Story'writes that a US-made cartrigde counter prototype was sent to Germany. He does not know whether the prototype was based on a B-series 9mm or a 7.65 trails gun.
In the time between the 7.65 mm trails and the 9mm cartrigde counter exchange another set of 9mm guns was brought into the US:
These were a couple of 9mm B-series prototypes with 3 7/8, 4 11/16 and 5 13/16 inch barrels. Some were numbered 10030B and 10060B.
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