Actually I have a spare stock of those I kept (6 came from an estate; many of the rifles were killed for parts in 1969) which has the takedown disc painted in blue - don't ask me what this was for.
Many of the stocks also have the French sling modification as well. This was since France left back the K98k rifles when they left Austria in 1955.
These rifles were meant to shoot well, they did this very well and they still do amazing. A sniper would not need a full length stock with bayonet lug - therefore cut back. Rubber pads btw were chosen since they did not slip as much as the original metal buttplate did. Very important for snipers - the Germans already addressed this with the checkered sniper buttplates. For the few hundred rifles that were ever made a newly designed cupped metal buttplate to fit the K98k stock would not make sense, hence they used something that was cheaply and easily available.
