Two more photos of early German WW1 snipers with Mauser sporting rifles:
A Karl Hartmann from Hallendorf, now part of Salzgitter near Brunswick.
Here you can see the warning tin plate that was nailed on the buttstock of 8x57I / M88 cartridge rifles.

Another with a Mauser sporter mounted with a long eye relief Voigtlaender “Skopar D” 3x scope.

The Prussian military acceptance “eagle” mark on the barrel of a Mauser sporter.