In the early 1970s there was an attempt made to limit german gun laws. Mauser was afraid that normal semi-autos would be banned completely, so they developed the sports version in an attempt to circumvent the new regulations. But the changes to the gun laws were limited, thus removing the need for a sports version. Resulting in very few manufactured.
The .30 luger version has a barrel with flattened sides to reduce weight. The 9mm is always round.
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