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Mossberg took everything people love about the 590 Shockwave and answered the one question everyone kept asking: what if it ran semi-auto? The 990 AfterShock is that answer. This 18.5-inch barrel version keeps the compact pistol-grip profile at just under 31 inches overall, but swaps the pump for a gas-operated action that cycles follow-up shots as fast as you can get back on target. At roughly 6.3 pounds, it handles quick and points naturally, which is exactly what you want out of a firearm built for tight spaces.
The gas system is fully contained in the forend, and Mossberg coated the hard-working parts, including the gas piston, magazine tube, hammer, and sear, in nickel boron for corrosion resistance and slick, consistent cycling. Loading is easier than most tube-fed guns thanks to an enlarged, beveled loading port, an elongated pinch-free elevator, and a bright orange anodized follower so you can see at a glance when the tube is empty. The oversized top-mounted safety works the same from either shoulder and shows a clear red indicator, and the paddle-style bolt release and knurled charging handle are both sized for gloved hands.
The AfterShock synthetic grip is shaped to lock into your hand, with a rubberized palm pad that takes real bite out of 12 gauge recoil and a QD cup at the rear for sling setups. Up front, the strapped forend keeps your support hand planted and safely behind the muzzle, and the magazine tube extension carries M-LOK slots on the sides and bottom for a light or other accessories. The 18.5-inch cylinder bore barrel wears a matte blued finish and an LPA fiber optic front sight that picks up fast in low light.
With 5+1 capacity, semi-auto speed, and the extra sight radius the longer barrel provides, this version of the AfterShock is a strong pick for home defense, truck duty, or anyone who wants the Shockwave concept with less pump work and softer recoil. It feeds standard 2.75-inch shells from the extended tube and patterns well with defensive loads through the open choke.
The biggest difference is the action. The 590 Shockwave is a pump gun, while the 990 AfterShock uses a gas-operated semi-auto system, so it cycles the next shell on its own. The gas system also soaks up a noticeable amount of recoil, which matters a lot in a pistol-grip 12 gauge. Beyond that, the AfterShock grip, strapped forend, and compact layout will feel familiar to Shockwave fans.
The gas system is tuned for standard 2.75-inch loads, and it runs well with typical defensive and field ammunition. Like most gas-operated shotguns, very light target loads can be less consistent, so it pays to test your preferred ammo before relying on it. The nickel boron-coated gas piston and internals help keep cycling smooth even as the gun gets dirty.
Yes. The magazine tube extension fixture has M-LOK slots on the sides and bottom, so you can attach a weapon light, hand stop, or other M-LOK accessories directly. There is also a QD cup at the rear of the grip for a single-point sling setup.
It holds five rounds of 2.75-inch shells in the extended magazine tube plus one in the chamber for a total of 5+1. The enlarged, beveled loading port and pinch-free elevator make topping off quick, and the bright orange follower gives you a fast visual check on an empty tube.
| UPC | 015813830027 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 83002 |
| Action | |
| ATF Type | Shotgun |
| Barrel Finish | Matte Blued |
| Barrel Length | 18.5" |
| Caliber/Gauge | 12 Gauge |
| Capacity | 5 |
| Chokes Included | Cylinder Bore |
| Color | BLUED |
| Length | 30.875'' |
| Magazine Included | 1 x 5-Round |
| Model | |
| Package Height | 2.7 |
| Package Width | 7.7 |
| Product Type | Shotgun |
| Safety | Ambidextrous |
| Shipping Weight | 8.037 |
| Sights | Fiber Optic Front |
| Sights Type | Fixed Sights |
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