I know this is an older thread but I think it only vaguely pinpointed this rifles origin....after WWI, Germany was not allowed to manufacture any military weapons in any quantity and they had a large supply of unfinished rifles and rifle parts but they could manufacture sporting arms, because your receiver was never for its original purpose completed it was not marked like a military rifle would have been, and therefore it is unlikely that we will never know its original or its secondary origin, if you remove the action from the stock and look under the receiver you will likely find several proof marks some can probably be identified with not much effort [look in the back of a Blue Book for starters] these post WWI sporters were made w/ different sights and optics from sniper systems used on K98's, most of them had double set triggers, and for some reason they had a lot of extra machinegun barrels that they used but they all shared one thing [except the high end custom guns] that's the stock, that light, petite, thin, but very serviceable, blond stock with those raised panels on its sides, and that shallow checkering on its pistol grip, was made from leftover military stocks, and was common sight in the European hunting fields in the days after WWI, I know of several that are still used for hunting today