Mossberg 990 Aftershock SPX 12 GA 14.375″ Barrel 5-Rounds…

Product Overview

The Mossberg 990 Aftershock SPX is a purpose-built, compact tactical shotgun designed for defensive and security applications. This 12-gauge semi-automatic model features a highly maneuverable 14.375-inch barrel, keeping it within NFA compliance for a Short-Barreled Shotgun (SBS) when properly registered, and is configured for optimal performance in close-quarters scenarios. It is engineered for law enforcement professionals, vetted security personnel, and responsible civilian shooters seeking a reliable, fast-handling defensive firearm for home defense or professional use. The 990 Aftershock SPX distinguishes itself with a modern M-LOK forend for customization and a 5+1 round capacity, delivering Mossberg’s renowned reliability in a potent, compact package.

Key Features

• Ultra-Compact 14.375-Inch Barrel: The shortened barrel profile significantly enhances maneuverability in tight spaces without compromising ballistic effectiveness, making the shotgun ideal for dynamic environments.
• Semi-Automatic Action with 5+1 Capacity: The gas-operated system reduces perceived recoil for faster follow-up shots, while the 5-round tubular magazine (plus one in the chamber) provides substantial on-board capacity for its role.
• M-LOK Compatible Tactical Forend: The lightweight forend features integrated M-LOK attachment points at the 3, 6, and 9 o’clock positions, allowing for the direct mounting of lights, lasers, vertical grips, and other accessories without bulky adapters.
• Durable Blued Finish: The classic blued metal finish provides a robust layer of corrosion resistance, protecting critical components and ensuring longevity with proper maintenance.
• Lightweight, Ergonomic Furniture: Designed for control, the tactical stock and forend offer a secure grip and positive handling characteristics, contributing to quick target acquisition and weapon retention.
• Defensive Configuration: From the factory, the 990 Aftershock SPX is presented in a ready-state configuration, emphasizing fast sight acquisition and intuitive handling right out of the case.

Performance & Applications

The Mossberg 990 Aftershock SPX is engineered for specific, high-stakes environments where reliability and compact firepower are paramount. Its performance characteristics make it suited for several focused applications.

Defensive Security & Tactical Use: For professionals in law enforcement or executive protection, the shotgun’s compact size is a significant advantage in vehicle-based operations or when clearing confined structures. The semi-automatic action allows for rapid, controlled engagement if necessary, and the M-LOK forend ensures essential tools like a white light can be mounted for positive threat identification in low-light conditions, a critical factor for compliance and safety.

Specialized Home Defense: In a responsible civilian context, the 990 Aftershock SPX serves as a dedicated home defense firearm. Its shorter overall length makes it easier to manipulate in hallways and doorways compared to a full-length shotgun. The reduced recoil impulse of the gas-operated system aids in manageability under stress, and the substantial 12-gauge payload offers definitive stopping power. It is imperative that users understand and comply with all National Firearms Act regulations regarding Short-Barreled Shotguns.

About Mossberg

For over a century, O.F. Mossberg & Sons has been a defining force in American firearms manufacturing, building a reputation on durability, innovation, and practical design. Mossberg’s expertise in shotguns is unparalleled, with the iconic Model 500 and 590 series serving as the standard-issue pump-action shotguns for the U.S. military—a testament to their proven reliability under extreme conditions. The company’s commitment to robust engineering, straightforward mechanics, and user-focused features is embedded in every product they make. When you choose a Mossberg, you are not just purchasing a firearm; you are acquiring a tool built on generations of specialized knowledge and a proven track record of performance that professionals trust.

Make Your Decision

The Mossberg 990 Aftershock SPX represents a serious investment in a professional-grade tactical shotgun. Its value lies in its optimized configuration, Mossberg’s legacy of reliability, and its ready-to-customize platform. This is not a general-purpose field gun; it is a specialized tool designed for defensive scenarios where its compact size, semi-automatic speed, and customization potential are critical advantages. Consider your specific needs, training requirements, and legal obligations. If your situation demands a highly maneuverable, dependable, and modern defensive shotgun, the 990 Aftershock SPX stands as a formidable option worthy of your consideration.

Technical Specifications

Frequently Asked Questions