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I have some criticisms of the C96 as a pistol, the gun is rather tall, the barrel far up on the gun, the grip far down and to the rear, this makes for a very tall bore axis and makes the pistol somewhat flippy in recoil. It overall has the form factor of a revolver.
The magazine in most of the Mauser made ones is fixed to the gun, detachable magazine models would come a lot later, and first on unlicensed clones of the C96. The magazine is loaded with stripper clips, like infantry bolt-action rifles of the day, in fact the C96 uses the same magazine design as the Mauser 98 rifles, just scaled down for the pistol cartridge, which Paul Mauser would brag about a little.
For the time, it makes sense, as it's far cheaper and easier to stamp a stripperclip out of brass than to build numerous magazines, and you're still looking at a huge speed advantage over any revolver, with some practice.
The sights are adjustable, and ranged out to 1000 meters, a range which is honestly optimistic for the average rifle. It's already rather challenging to shoot at a target at half that distance, if you even spot them. The 7.63mm Mauser cartridge has a pretty flat trajectory, but you're still looking at angling the pistol like an artillery piece at ranges like those. Leave it sighted in at a low setting for best results.