The 590A1 SPX is the most accessorized factory 590A1, shipping with an M-LOK forend, ghost ring sights, Picatinny rail, and bayonet lug. The SPX designation stands for Special Purpose Xtended and represents the peak tactical configuration of the 590A1 platform. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 2008, USA Weight: 128 oz Overall length: 41" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Tactical