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No they don't make a 20G Magazine and this fits - Mossberg 590M Mag-Fed Factory Built 12 Gauge Shotgun Only Note: Will NOT work with a standard Mossberg 590.

Shamare, no it fits only the 12 Gauge. Maybe the 20 Gauge Mag Fed shotgun will be in the near future.

Hi Shamare, No they don't make a 20G Magazine and this fits - Mossberg 590M Mag-Fed Factory Built 12 Gauge Shotgun Only Note: Will NOT work with a standard Mossberg 590.

sorry at this time Mossberg does not make a 20 ga detachable magazine shockwave the only make the 20 ga shockwave with a 6 round tube magazine