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Tokarev themselves specify it is ONLY for 12G. https://tokarevusa.com/tokarev-ott-bayonet-mount-kit-ni/

no it will not fit the 20 ga without modifications. you most likely could make it fit by making a spacer to allow it to tighten on the smaller diameter 20 ga gun

Hi Steven and welcome. It fits 12ga "Only". Looks like an inner cylinder sleeve would work. 12-gauge: Has a bore diameter of 0.729 in (18.5 mm) 20-gauge: Has a bore diameter of 0.615 in (15.6 mm) = a .114 or 2.8956mm difference. Cheers, stay safe and enjoy!