Hi, Barry,
AFAIK, the basic reference points of the Luger grip piece was the flat top and the rear face, not the stock lug. I think the stock lug stayed for the reason I gave, that the army specs were never changed. Various improvements could have been made to the U.S. M1911 also, but aside from the update to the M1911A1 they were never made. Military designs tend to be "frozen" once a design is formally adopted, mostly because of concern about non-interchangeability of parts, changes to manuals, delay of production while changes are made, changes to training documents, etc.
Jim
|