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Yes Branden, this fits the 500/590 series shotguns.

Branden, will not fit the 590/500 as is. This Pistol Grip Fits Mossberg 500 and 590 Flex series shotguns and requires a 12 or 20 gauge FLEX stock adapter. Installation vodeo of the required Adapter here : https://www.mossberg.com/how-to-install-flex/

Branden -James is correct - it does require an adapter to install. I should have mentioned that. Sorry. https://www.ammoland.com/2017/06/mossberg-introduces-flex-conversion-kits-mossberg-500-maverick-88/#axzz5tnyUARTd