Mossberg 83001 990 AfterShock 12 Gauge Semi-Auto 3" 5+1 14.75" Matte Blued Barrel, Strapped w/M-LOK Forend, Matte Blued Receiver, Black Synthetic Aftershock Grip, Ambidextrous

The Mossberg 990 AfterShock is a compact 12 gauge semi-auto shotgun built for shooters who need fast handling and tactical versatility in a tight package. At 14.75 inches with a matte blued barrel and receiver, this 3-inch magnum delivers 5+1 capacity with the kind of ergonomic features you'd expect on a purpose-built platform: ambidextrous controls, a forend strap to keep your hand clear of the muzzle, and an M-LOK mounting system for customization. Whether you're running it for home defense, tactical training, or hunting close quarters, the 990 AfterShock strips away the bloat and focuses on what matters—controllability, reliability, and the ability to mount gear where you need it.

The gun's action is built around a gas system with corrosion-resistant internals: a nickel boron-coated gas piston, magazine tube, hammer, and sear all contribute to smooth, low-maintenance operation. The AfterShock grip itself—that black synthetic stock—is shaped to absorb recoil and seat your hand naturally, with a rubberized palm pad for comfort during sustained fire. An enlarged, beveled loading port makes feeding rounds faster and easier, backed by an anodized orange follower and elongated elevator that won't pinch. Every detail on this gun serves function.

Controls are uncompromised. The charging handle is knurled for a sure grip, the bolt release is oversized and paddle-style (ambidextrous, naturally), and the safety sports a red indicator and is equally reachable from either side. The forend strap and M-LOK slots on the magazine extension give you mounting flexibility without adding bulk—keep it stock or thread lights, lasers, or support gear onto the platform you already have. The included Lasersaddle (5mW, windage and elevation adjustable, multi-point touchpad activation) gives you a fast sighting option right out of the box, and it mounts directly to the receiver without disrupting the gun's lines.

This is a shotgun that doesn't pretend to be something it isn't. It's compact, it points naturally, and it runs. That's the Mossberg 990 AfterShock formula.

Key Features

• Gas-operated semi-auto action with corrosion-resistant internals (nickel boron-coated gas piston, magazine tube, hammer, sear)
• 5+1 capacity with enlarged, beveled loading port and anodized orange follower
• Compact 14.75" matte blued barrel; matte blued receiver
• AfterShock grip with rubberized palm pad designed to minimize felt recoil
• Forend strap keeps lead hand clear of muzzle
• M-LOK mounting slots on magazine extension for tactical accessory mounting
• Ambidextrous controls: safety with red indicator, paddle-style bolt release, knurled charging handle
• Included 5mW Lasersaddle with windage/elevation adjustment and multi-point touchpad activation
• Accepts 3" magnum shells
• Rear swivel stud port

Specifications

Frequently Asked Questions

What shells does the Mossberg 990 AfterShock chamber?

The 990 AfterShock is a 12 gauge shotgun with a 3-inch chamber, so it'll fire standard 2.75-inch loads and 3-inch magnum shells.

Is this shotgun set up for left-handed shooters?

Yes. The 990 AfterShock features ambidextrous controls, including an ambidextrous safety and paddle-style bolt release that are equally accessible from either side of the gun.

Can I mount accessories like lights or lasers on this shotgun?

Yes. The magazine extension features M-LOK mounting slots on the sides and bottom, so you can easily attach lights, lasers, or other gear. A 5mW Lasersaddle is included and mounts to the receiver.

What's the barrel length, and why does that matter for home defense?

The barrel is 14.75 inches, which makes the gun ultra-compact and easy to maneuver in tight spaces—a big advantage in hallways, vehicles, or defensive scenarios where you need a shotgun you can handle quickly without compromising controllability.