Mossberg 990 SPX AfterShock – 12 Gauge, Matte Blued

The Mossberg 990 SPX AfterShock is a compact semi-automatic 12 Gauge shotgun designed for defensive and security use. It ships optic-ready with a Shield RMSc footprint and includes adapter plates to fit common footprints. The platform features an AfterShock grip, a knurled charging handle, and a forend with an integrated heat shield and multiple M-LOK accessory slots. The receiver and internals are finished for corrosion resistance, and the action accepts 3″ shells.

Key Specifications

• The action is Semi-Auto.
• The gauge is 12 Gauge.
• The chamber accepts 3″ shells.
• The finish is Matte Blued.
• The color is Black.
• The model is 990.
• The receiver is optic-ready with a Shield RMSc footprint and adapter plates included.
• The forend features M-LOK slots and an integrated heat shield for accessory mounting and heat management.
• The stock/grip is the AfterShock design to improve purchase and reduce felt recoil.
• The sights are Fiber Optic with low-profile protective wings.

Built to modern modular standards, the 990 SPX AfterShock balances compact handling with practical accessory options. Its optic-ready receiver, M-LOK-capable forend and ergonomically focused grip make it a straightforward choice for users seeking a configurable, compact semi-automatic 12 gauge platform with attention to handling and corrosion-resistant internal finishes.

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