Originally Posted by
RC20
Guffey is his usual obscure self.
I am not a world expert of course, just a piss ant enthusiast. All the 1917s I have now and the ones gone through my hands (8 or so) all had mixed parts and they all worked fine.
My take was the Parts thing was stupid, better get the guns in the hands of the troops to train and worry about the fit stuff latter. You could even mark them at the Army level you wanted to. The Army does stupid stuff on a regular basis so nothing new. It has its bureaucracy and that gets in the way of stuff to the troops when needed.
So, having worked with tolerances, my guess is that they had the range of plus and minus that was allowed but hit it a lot closer most of the time. Ergo, the parts would work though you might have an occasional one that did not.