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I'm not aware of any 50 round 12 gauge drums in existence, the closest being a 30-round drum from Defenseport which is already comically huge. But any MKA1919 pattern magazine should work fine.

Hi Christopher and welcome. The max capacity drum is the DefensePort 30rd drum: https://defenceport.com/en/p/products/magazines-6/ ------------ Cheers and stay safe!