The Mossberg 590 Flex uses a FLEX stock adaptor system allowing tool-free switching between pistol grip, standard, folding, and collapsible stock configurations. The 20-inch barrel and 7+1 capacity are shared with the standard 590. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 7 Year introduced: 2012, USA Weight: 7.5 oz Overall length: 40" Status: Active Intended use: Home Defense, Tactical