This is not a "model C" or "Army Hunting Rifle", but a type B, full-blown sporter on an intermediate length action just like the barreled actions used for the famous .275 Rigby rifles. The stock shape with round pistol grip, half oval side panels, cheekpiece and sloping foreend is the typical Mauser sporter stock as made up to 1912. Only then stock shape was changed by Mauser to a capped pistol grip, smooth sides and Schnabel foreend. BTW, the letter A, B, C, M and S for the different sporter types were introduced by the Mauser factory only after WW1, in 1922.