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So an extended magazine of 20 rounds sounds like a great idea, and Mauser thought so too, thus one of the demonstration models they came up with was a C96 with just that.
Issue is, this is a fixed 20rd magazine. These were frequently sent in packages with other variants of the C96, just to see if anyone would like it, as it turns out, no, not really. What happens when you strip a 10rd clip into the C96s magazine is that the bolt slams shut once you remove the clip, which for the normal pistol is fine, but for the extended one gets in the way of its gimmick, you need to manually hold the bolt back and try to fit and strip the second clip in there, and the spring is actually rather stiff once 10rds are already loaded.
You could put in the effort to load the extra 20 rounds in advance, but on the battlefield or any combat situation, you're probably not going to want to struggle with that.
These models were not liked by anyone, and thus saw basically no sales, Mauser had made a few of these pistols and they just lingered in their catalogue for years. They're rare now, extra collectible.
Companies making unlicensed clones of the C96 later one-ups Mauser with detachable magazine models, of 10rd capacity but also 20rd capacity, considerably easier to load in advance and then reload with as necessary.
