Mossberg 590 Special Purpose SBS in 12 gauge with 14-inch barrel. NFA-regulated short-barreled shotgun for law enforcement and military. Requires NFA tax stamp. Type: Short-Barreled Shotgun Action: Pump Caliber: 12 Gauge Capacity: 6 Year introduced: 1990, USA Weight: 6.5 oz Overall length: 26" Status: Active Military use: Yes Intended use: Military/Law Enforcement