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Eric, regular 20ga 500 barrels should all work with that gun provided they are for a 6-shot model. Here is a 26" on the Mossberg store: https://www.mossberg.com/store/500-20-gauge-all-purpose-barrel-26-blued-90136.html
here you go this barrel will fit great and comes with 3 chokes https://www.budsgunshop.com/catalog/product_info.php/products_id/712014143/moss+bbl+500+20ga+26+accu+set+bd+sght This is a factory replacement/extra barrel for the Mossberg 500 or Maverick 88, 20 gauge shotguns. It's a smooth bore barrel with an Accu-Set Choke System for fantastic consistent patterns. It must be used with models that have a 6 shot mag tube and it is not compatible with extended magazine tubes. Get into the field and hunting with a Mossberg All-Purpose Shotgun Barrel! Specifications and Features: Mossberg 500 All-Purpose Shotgun Barrel 90061 20 Gauge 3" Chamber 26" Length Smooth Bore Vented Rib Bead Sight Matte Blued Weight 2 Pounds 8 Ounces Includes: Accu-Set Choke System Fits: Mossberg 500 and Maverick 88, 20 Gauge with 6 Shot Magazine Tube