Found this one in Spain’s Guardia Civil website:
Tried to look for more info about it but other than identifying it as a PD model manufactured in the 1930s, there was nothing out there. the magazine appears to have a 32 round capacity which makes me think it was a 9mm (either 9×19 or 9×21) and in the tradition of the Luger, you could store the gun inside the stock. Where you could store the magazine? No idea.
I have a star (though mine is semi) chambered in 9mm largo. Along with a destroyer carbine and an astara pistol. Fun little guns but the star’s hAmmer bites quite a bit.
It would have to be 9mm. The 9mm case is slightly tapered so a long enough magazine would have to curve (think MP5). The .45 is straight walled and doesn’t need a curved mag.
This may have some more information (looks like it was at least part of the same family of machine pistols):
http://www.star-firearms.com/firearms/guns/smgD/
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