Mossberg Flex Synthetic Tactical Stock 6-Position Black for Mossberg Flex 500/590 - 95219. 6-Position adjustable synthetic tactical stock. Length of pull is adjusted through an integrated lever. Oversized rubber recoil pad. 11 to 14.25 inch length of pull. Features the Tool-less Locking System. No tools necessary to make changes. Compatible only with Mossberg Flex 500/590.