De gustibus non disputandum est.

The square bridges were designed to facilitate scope mounting, but in some cases that meant avoiding the questionable practice of dovetailing the receiver ring for a claw mount base by making the protuberance available for that purpose, or for machining the claw mount bases directly into the receiver.

Nowadays we see pivot mount bases installed the same way, but the Germans are not too fond of Aufschubmontagen (mounts by which the rings are secured to the bases by a dove tail arrangement, like the Talley) and I have never seen a German double square bridge Mauser fitted with such a mount, as opposed to the Czech BRNO/CZ rifles, with their integral dovetail bases, which were obviously designed with that sort of ring arrangement in mind.