Description

The Mossberg 990 Aftershock is a 12 ga, 3-inch semi-automatic shotgun introduced by Mossberg as a compact tactical platform with a rugged gas-operating system and enhanced ergonomic controls. It’s designed for close-quarters and defense-oriented applications, featuring a range of modern tactical features like oversized controls, M-LOK accessory mounting, and a fiber-optic front sight. The platform is available with either a 14.75″ or an 18.5″ cylinder-bore barrel.

Specifications

• Series: Mossberg 990 Aftershock 12 Gauge semi-automatic shotgun
• Action Type: Gas-operated semi-automatic
• Gauge: 12 Gauge (3″ chamber)
• Chamber Size: 3″ shotshells
• Barrel Length Options:
  • 14.75″ version (compact)
  • 18.5″ version (more traditional semi-auto length)

• Barrel Finish: Matte blued steel
• Choke / Bore: Cylinder bore (fixed)
• Capacity: ~5 + 1 rounds (with 2.75″ shells)
• Overall Length:
  • ~27.13″ (14.75″ barrel)
  • ~30.88″ (18.5″ barrel)

• Weight: ~6.0 lbs
• Sights: LPA front fiber-optic sight or similar high-visibility front sight
• Stock / Grip: AfterShock grip with strapped forend and M-LOK accessory mounts; black synthetic
• Safety: Oversized, ergonomic safety easily reached left or right-handed
• Controls: Enlarged and beveled loading port, elongated elevator, knurled charging handle, oversized bolt release
• Magazine Tube: Extended tube with M-LOK mounting slots for accessories
• Finish: Matte blue metal finish on barrel/receiver (black synthetic furniture)
• Intended Use: Tactical / defensive applications and compact semi-auto performance

 Design & Feature

• Gas-Operated System: Unlike many compact tactical guns that use pump actions, the Aftershock uses a gas system with corrosion-resistant internals (nickel-boron coated components) for reliable cycling.
• Ergonomic Controls: Oversized safety, knurled charging handle, and elongated elevator were designed to support quicker manipulation and positive control.
• Accessory-Ready: The forend and magazine tube include M-LOK slots for mounting lights, grips, or other accessories.
• AfterShock Grip: Unique grip profile with a rubberized palm pad improves handling and recoil feel.
• Fiber-Optic Sight: High-visibility front fiber-optic sight aids quick.