Mossberg 990 Aftershock SPX Shotgun 12 ga 3" Chamber 5rd Capacity 14.375" Barrel OD Green

The Mossberg 990 Aftershock SPX is a compact 12-gauge semi-automatic shotgun built for shooters who need serious capability in a maneuverable package. With a 14.375" barrel and purposeful tactical features, this 3" chamber shotgun delivers the firepower and ergonomics that law enforcement, home defense, and sport shooters demand—without the unwieldy length of a traditional 12-gauge.

What sets the 990 Aftershock SPX apart is its commitment to customization and shootability. The integrated heat shield forend isn't just functional—it keeps your hands safe during sustained fire and integrates M-LOK slots for mounting lights, rails, or other accessories exactly where you need them. The gas system is durable and designed to resist corrosion, a real advantage if you're shooting in harsh conditions. The enlarged, beveled loading port means faster, smoother reloads under pressure, while the knurled charging handle and oversized safety give you positive control even with cold hands or gloves.

Optics-ready out of the box, the 990 Aftershock SPX comes set up for Shield RMSc footprint red dots and includes three additional adapter plates so you can mount RMR, Docter, or Leupold footprint optics. The front fiber optic sight with low-profile protective wings provides a quick point of aim without getting in the way of your optic or limiting sight picture. The AfterShock grip helps manage felt recoil while anchoring your control, and the 5+1 capacity gives you plenty of rounds for defensive, sport, or tactical applications.

At 27.125" overall length and 6.04 lbs, this OD Green shotgun is compact enough to store, transport, and shoot in tight spaces—but substantial enough to deliver the 12-gauge authority serious work demands. The Accu-Choke system with cylinder bore installed gives you a platform to fine-tune your shot pattern for your mission.

Key Features

• Optics-ready platform with Shield RMSc footprint; includes three additional adapter plates (RMR, Docter, Leupold)
• Integrated heat shield forend with M-LOK mounting slots for tactical customization
• Durable gas system with corrosion-resistant internal finishes
• Enlarged, beveled loading port for faster reloads
• AfterShock grip engineered to reduce felt recoil
• Knurled charging handle and oversized, ergonomic safety and bolt release
• Magazine tube extension with M-LOK slots
• Front fiber optic sight with low-profile protective wings
• Accu-Choke system with cylinder bore installed
• 5+1 round capacity

Specifications

Frequently Asked Questions

What red dot or optic can I mount on the 990 Aftershock SPX?

The shotgun comes optics-ready with a Shield RMSc footprint integrated into the receiver. It ships with three additional adapter plates so you can also mount optics with RMR, Docter, or Leupold footprints. Choose the plate that matches your red dot and you're good to go.

Is this shotgun suitable for home defense or tactical use?

Yes. The 990 Aftershock SPX is designed with home defense and tactical applications in mind. Its compact 14.375" barrel, 27.125" overall length, and maneuverable profile make it well-suited for tight spaces. The 5+1 capacity, controllable recoil management through the AfterShock grip, and optics-ready platform give you a practical, configurable defensive shotgun.

What choke comes installed?

The shotgun ships with an Accu-Choke system and has cylinder bore installed. You can swap chokes as needed for your ammunition and intended use.

What's included in the box?

The 990 Aftershock SPX comes with three additional optic adapter plates (RMR, Docter, and Leupold footprints) in addition to the Shield RMSc footprint already integrated into the receiver.