Mossberg 990 Aftershock SPX 12ga 18.5in

The Mossberg 990 Aftershock SPX is a compact semi-automatic 12 Gauge shotgun with an 18.5-inch barrel designed for defensive and security applications. It features an optic-ready receiver with a Shield RMSc footprint, an ergonomically contoured AfterShock grip, and a modern M-LOK forend with QD ports for accessory attachment. The design emphasizes maneuverability, modularity and user-focused controls for practical use in close quarters and routine defensive roles.

Key Specifications

• The shotgun is chambered for 3-inch shells.
• The gauge is 12 Gauge.
• The barrel length is 18.5 inches.
• The action type is Semi-Auto.
• Sights include a Fiber Optic front sight.
• The receiver is drilled and tapped for optics.
• Optic mounting uses a Shield RMSc footprint.
• The forend offers M-LOK accessory slots and QD ports.
• The barrel features an integrated heat shield.
• The weight is 6.29 lbs with an overall length of 30.88 inches.

With its compact 18.5-inch profile, optic-ready receiver and M-LOK-equipped forend, the 990 Aftershock SPX provides a balanced blend of handling and modularity for home defense and security-oriented applications. The AfterShock grip and corrosion-resistant internal finishes contribute to controllability and durability in routine use, while the drilled-and-tapped receiver supports a range of sighting options for operator preference.