Some clarification:
The difference between the New Model short and long frames is 2mm length at the front of the frame. There is no difference at the back.
The Mauser full 1mm extension at the rear frame is not "reinforced". This term is properly applied to frames which have less material removed from the inner surface of the rear of the frame. This modification began with Erfurt in 1911 and DWM in 1914, and continued throughout P08 production.
The modification which resulted in the Mauser "hump" was removal of 1mm of rear frame length extension except at the frame ears. This removal includes the center portion of the frame which the toggle tail strikes on manual operation. This allows the breechblock to be drawn back to its original rearward movement specification, which the full 1mm extension did not allow.
--Dwight
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