As far as I can tell, there were two main reasons to swap out a complete toggle train. The first is obvious, a broken, cracked or severely worn major part? Ok, we can see that, but the second reason is not so glaringly apparent, and that is head space? It is far easier to just swap out assemblies and check, then it is to ream the chamber ever so slightly to make it, (headspace) correct? Also, the barrel chamber is initially cut to a very precise depth and seems to be consistent throughout manufacture? (my experience is any Luger factory barrel will install on any factory receiver, and the head space will be very, very close! If not perfect!) It doesn't take much pin wear to make a toggle assembly that allows too much head space, that is followed soon by pierced primers and means, your Luger only has a few more rounds to live???...
... best to all, til....lat'r....GT
