930 SPX magazine cap and spring to hunt with?

[WiKDMoNKY]

I am looking to do some duck hunting with my buddy and I wanted to temporarily make my 930 SPX a little less tactical and a little more huntical. I already have a custom 28" ported barrel from Mossberg (for clay) and figured removing the mag extension would make it less likely to attract a ranger. Does anyone know if I need get the 835 or 590 magazine cap and spring or does the 930 have a specific one?

Thanks in advance!