The 590M Flex is the modular-stock variant of the Mossberg 590M mag-fed pump, incorporating the FLEX tool-less stock interchange system. Owners can swap between pistol-grip stocks, full stocks, and adjustable stocks without tools. Ships with the adjustable FLEX stock and accepts the full 590M magazine line. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 10 Year introduced: 2019, USA Weight: 96 oz Overall length: 38.5" Status: Active Intended use: tactical, home_defense, law_enforcement