Mossberg 990 Aftershock 12-Gauge Semi-Auto Shotgun
Ultra-compact 12-gauge semi-auto with 5+1 capacity and 18.5-inch barrel. Features gas-operated reliability, corrosion-resistant internals, M-LOK accessory slots, and ergonomic Aftershock grip for tactical performance.
Mossberg 990 Aftershock: Compact Tactical Performance
The 990 Aftershock represents a thoughtful approach to modern shotgun design—small in footprint, substantial in capability. This semi-automatic 12-gauge delivers the firepower and reliability serious shooters demand in a platform that remains maneuverable in tight quarters.
Core Features
Action and Reliability
- Semi-automatic gas-operated system for consistent cycling
- Durable internal components with nickel boron coating on gas piston, magazine tube, hammer, and sear for corrosion resistance
- 5+1 capacity with 2.75-inch shells; 3-inch chamber for magnum loads
- 18.5-inch barrel with cylinder bore choke
Ergonomic Design
- Aftershock grip with rubberized palm pad for positive control
- Strapped forend with Mossberg signature texturing and embossed strap for secure handling
- Oversized safety for quick operation
- Enlarged, beveled loading port and elongated elevator for smooth feeding
- Anodized follower for durability
Tactical Capability
- M-LOK mounting slots on magazine tube sides and bottom for versatile accessory attachment
- Front fiber optic sight for target acquisition
- Overall length of 27.125 inches—compact enough for vehicle storage or home defense
- Weight of 6.04 pounds keeps recoil management practical
The Right Tool
Whether your focus is home defense, tactical training, or professional security work, the 990 Aftershock delivers semi-auto convenience without unnecessary bulk. It's a shotgun built for those who understand that effectiveness comes from reliable design, not complexity.
Features
- chambered in: 12 gauge
- operation: semi-automatic
- barrel length: 18.5 inches
- capacity: 5+1
- sight: front fiber optic sight
- gas system: nickel boron-coated gas system and internal components
- port: enlarged/beveled loading port
- follower: anodized
- forend: synthetic black strapped with m-lok slots
- grip: aftershock grip with rubberized palm pad
- forend texture: streamlined with mossberg signature texturing
- safety: ergonomic, oversized
- weight: 6.24 lbs.
- m-lok mounting slots
