Military and law enforcement specification 500 with 18.5-inch barrel, synthetic stock, and parkerized finish. The SPT was Mossberg's formal bid for law enforcement procurement contracts. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 1982, USA Weight: 7.25 oz Overall length: 38.5" Status: Active Intended use: Law Enforcement