I do not have a long-barrel C96, but from my measurements, it could not accommodate anything longer than a 5" barrel. And indeed the tag on it says "1930 Mauser pistol" I do not know by whom or why. I think the M1930s have a 5.1" barrel, and if so, those would probably fit into this holster. But the question remains as to what the holster is. Police? Military? Civilian? whose? And no markings are on it to help.