This site makes no mention of different mags. Star Firearms — Models 28, 30 & 31
Star Firearms : Information on Magazines

This seller reckons the triple K mags won't work in the 30PK. Star 28/30/31 magazine 9mm 15RD : Pistol Magazines & Pistol Clips at GunBroker.com

I understand that 59 series mags will work in many of these big Stars. If they don't work straightaway, then minor fettling of the mag catch hole will usually do the trick.

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Release the Kraken