Pete,
The Germans were not known for doing things that don't make sense (at least not back then...lately their government has been pulling some really wierd stuff)... I submit that as time and requirements changed, they determined about 1914 that there were simpler methods and possibly newer and better tools for production of the Luger frame and for exactly the reasons mentioned by "Lugerdoc" Heller.
A question for you... do you know if any Lugers were produced AFTER 1914 that didn't include the stock lug? I may be wrong, but I can't think of any production runs offhand that were without a stock lug...
If it were for small commercial production runs, it was probably easier to take a standard frame and remove the lug...
Your reference library is larger than mine... sounds like a nice research project for you to spend time on this weekend...
