Even so if one buys a rifle and starts swapping bits and pieces to make it all matching then in reality its a bits'a as the only real way of having an all correct rifle would be a mum wrapped straight off the factory floor on the day it was made.
I brought bits for my 5MD 1916 Lithgowicon as it was missing a few key components namely the magazine and complete safety catch & sling, oiler/pull through etc so swapping out other smaller pieces in period correct was no big deal so now its is a bitsa but with 1916 period correct minor Lithgow parts.