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here is a good 3 round extension https://www.usaeuropeoutdoor.com/product/choate-02-04-43-mossberg-sa20-8-shot-magazine-extension-for-sale/

Jason, the extension you will need for your SA-20 is in stock here : https://www.riflestock.com/store/product/mossberg-sa20-20ga-8-shot-magazine-extension/