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no it would be to loose around the 20 gauge magazine

Hi Gavin and welcome. Unfortunately, this is for 12ga only. The Choate Machine and Tool Night Manager (long or short depending on your 88's-barrel length) will work: https://www.riflestock.com/store/product-category/shotgun-products/mossberg/

Hi Gavin, no sir, this is for 12 gauge only. Stay safe & have a great day.