There is a company in Texas that is making a really good minishell adapter for the mossberg 500 and in my opinion is a better alternative to the 590S. Cost is great too if anyone is shooting the mini's.
$25 shipped. They have several other neat stuff for the mossberg and remington guns too.
https://defendertactical.com/products/1-3-4-to-3-shell-adapter-for-mossberg%C2%A9-500-series
