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Hi Bayardo, Your 20" Security model has a 7-shot mag tube. The longer field barrels are designed to fit on models with the shorter 5-shot mag tubes. To install a 24" or 28" barrel on yours, you would first need to replace your mag tube with a 5-shot. It's not a difficult swap, but it will be a bit more expensive than just buying a new barrel. Honestly, considering the price of the barrel, tube, and replacement spring, the cost of the conversion might justify simply buying a new Mav88 Field model with your desired barrel length...

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no the barrels are different here a setup for you to look at Remington 870 combo 18 inch cylinder bore barrel and a 26 inch choke tube barrel the add a 3 round extension (common for Remington) here are the links that you would want https://www.budsgunshop.com/catalog/product_info.php/products_id/33431/Remington+870+Express+12+26M%2F18CYL+Synthetic+ and https://www.budsgunshop.com/catalog/product_info.php/products_id/76115?utm_source=bing&utm_medium=cpc&utm_campaign=BudsProducts&utm_term=1101206460527&utm_content=Ad%2520group%2520%25231