The 500 FLEX uses Mossberg's tool-free FLEX system to swap stocks, forends, recoil pads, and barrel adapters without tools in seconds. One receiver becomes a field gun, home-defense shotgun, or youth configuration by swapping components. Available in 12 and 20 gauge. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 2012, USA Weight: 112 oz Overall length: 48" Status: Active Intended use: Hunting, Home Defense, Field, Multi-Purpose, hunting,home-defense