The sights could have been improved with an easy windage adjustment like the M1918 BAR.
You can count on the fingers of a three fingered man, the number of service rifles with windage adjustment on the rear sights. Might take two hands with three fingers, but just try to find windage adjustable sights. Some SMLE's had them, but the British removed those.
this rear sight is not original to this rifle, I installed it myself
Obviously the people in charge came to the conclusion that if the rifle windage was off, that was something left for the Unit Armorer to fix. Just look at the front sights of the rifle No 4 MkI's of WW2. The British used a screw on the front sight base that held the front sight blade that required a special tool to loosen, to prevent the Tommies from drifting the front sight blades by themselves.
this war time rifle had two elevation settings. The theory was putting the bayonet would have different zeros for distances between 200 yards and 600 yards.
this was a good rear sight, no windage adjustment though.
I can't recall a Mauser with windage adjustment
This device was made by the Swiss to move their front sights. These are rare enough to command high prices.
the rear was only adjustable for elevation.
The rear sight of a M1917 is simple and straightforward
I have no idea how to use all the parts of this rear sight. Might take four years of class room education to learn the thing.