Charles, yes Sir, Mossberg 88 and 500 Barrels are fully interchangeable It is in stock at Buds : budsgunshop.com/product_info.php/products_id/46931/mossberg+500xbl+20g+24%22+rs+rb+ported --------------- You can compare best price of barrel + shipping here : ---- https://gun.deals/search/apachesolr_search/015813920629

Charles, Here is the 24" rifled 20 ga Mossberg factory barrel. $176----------budsgunshop.com/product_info.php/products_id/46931/mossberg+500xbl+20g+24%22+rs+rb+ported />---------budsgunshop.com/product_info.php/products_id/46756/mossberg+500xbl+20g+24%22+rb%2fisb />If you go to another site the barrels are models 92062 and 90063.
There are more options, but not in stock at BUDs.

Hi. Yes you can.
This is what I found for you on their website.
Maverick 88 pump-action models are fully-interchangeable with Mossberg 500 barrels (within gauge and capacity). The diverse selection of available accessory barrels allow shooters to adapt their Maverick 88 for multiple hunting or security purposes.
I saw different prices up to a little over $200
mossberg.com/category/series/maverick-88/