Mossberg® Releases 990™ Aftershock™ SPX Semi-Auto Firearm

Mossberg is pleased to announce the all-new 990 Aftershock SPX, a 12-gauge, 3-inch semi-auto tactical firearm that enhances the compact Aftershock platform with advanced SPX-level features. Small in size yet big on performance, the 990 Aftershock SPX combines proven Mossberg reliability with modern accessory compatibility and an optic-ready design. This highly maneuverable platform is available with 14.75-inch or 18.5-inch barrel options.

At the core of the 990 Aftershock SPX is a durable gas-operating system fully contained within the forend, engineered for consistent, reliable cycling. Critical internal components—including the gas piston, magazine tube, hammer, and sear—feature nickel-boron coatings and specialized finishes for enhanced corrosion resistance and smooth operation. Performance features include an enlarged and beveled loading port, elongated pinch-free elevator, and a high-visibility anodized orange follower. The oversized, ergonomic top-mounted safety is easily operated by both left- and right-handed shooters and includes a clearly visible red indicator.

Enhancing versatility, the 990 Aftershock SPX incorporates the SPX handguard shared with the 940® Pro Tactical SPX, offering a rigid, heat-resistant design with integrated M-LOK® mounting slots for accessories. Controls are optimized for confident operation and include a knurled charging handle, oversized paddle-style bolt release, and an optimized tang-mounted safety.

Further distinguishing the SPX, the 990 Aftershock SPX features the same optic-ready receiver cut as the 940 Pro Tactical SPX, allowing for direct mounting of micro-dot optics. A winged front fiber optic sight completes the sighting system, delivering fast target acquisition and seamless optic compatibility.

The exterior design reflects Mossberg’s focus on ergonomic efficiency and tactical performance. The black synthetic Aftershock grip provides a secure, comfortable hold and features a rubberized palm pad to reduce felt recoil, along with an integrated quick-detachment sling cup. Complementing the grip, the SPX handguard maintains a streamlined profile while delivering exceptional durability.

Completing the 990 Aftershock SPX are 14.75-inch or 18.5-inch Accu-Choke® barrels, 5+1 capacity with 2.75-inch shotshells, and a choice of matte blue metal or Cerakote® finishes.

Mossberg continues to deliver innovation, reliability, and exceptional tactical performance with the 990 Aftershock SPX—a premium defensive tool that blends compact handling with modern tactical capability.

For more information, please visit www.mossberg.com.

990 Aftershock SPX 6-Shot(Matte Blue):

990 Aftershock SPX 6-Shot(FDE Cerakote):

990 Aftershock SPX 6-Shot(ODG Cerakote):

990 Aftershock SPX 8-Shot(Matte Blue):

Mossberg 990 SPX Magpul Semi-Auto Shotgun Specifications: