The Mossberg 590 in the shorter 18.5-inch configuration holds 5+1 rounds. Heavier construction than the 500 with metal trigger guard and metal safety. More compact than the 20-inch model while maintaining military-grade durability. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 6 Year introduced: 1987, USA Weight: 7 oz Overall length: 38.5" Status: Active Military use: Yes Intended use: Tactical, Law Enforcement, Home Defense