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Mossberg changed the game back in 2017 with the 590 Shockwave, and the 990 AfterShock is the natural next step: take that ultra-compact pistol grip format and give it a gas-operated semi-auto action. The result is a 12 gauge that measures just 27.125 inches from muzzle to grip, holds 5+1 rounds, and cycles follow-up shots as fast as you can get the fiber optic front sight back on target. With a 3 inch chamber and cylinder bore choke, it digests everything from buckshot to slugs without fuss.
Mossberg built this one to run for the long haul. The gas piston, magazine tube, hammer, and sear all wear nickel boron coatings for corrosion resistance and smoother cycling, and the whole package weighs in at 6.04 pounds, which is enough heft to soak up a meaningful amount of 12 gauge recoil. Loading is quicker than you might expect thanks to an enlarged, beveled loading port, an elongated pinch-free elevator, and a bright orange anodized follower so you can confirm an empty tube at a glance. The knurled charging handle and oversized bolt release are easy to work under pressure, and the ambidextrous safety carries a highly visible red indicator.
The bird's head style AfterShock grip is shaped to roll with recoil instead of fighting it, and a rubberized palm pad takes the sting out of stout loads. Up front, the streamlined forend wears Mossberg's signature texturing plus an embossed hand strap that keeps your support hand planted and well clear of the muzzle, which matters on a firearm this short. There's also a rear swivel stud port for sling setups.
The magazine tube extension fixture includes M-LOK slots on the sides and bottom, so adding a light or other accessories takes minutes, not a trip to the gunsmith. For a truck gun, camp companion, or bedside option that stores just about anywhere, the 990 AfterShock packs a lot of capability into a very small footprint, and it's made in the USA.
The biggest difference is the action. The 590 Shockwave is a pump, while the 990 AfterShock uses a gas-operated semi-auto system, so it cycles the next round for you and lets the gas system bleed off some recoil in the process. It keeps the same ultra-compact bird's head grip format, but adds nickel boron coated internals, an enlarged loading port, and M-LOK slots on the mag tube extension.
It's more manageable than you'd guess. The gas system takes the edge off compared to a pump like the Shockwave, and at just over 6 pounds it has real weight to absorb the push. The rubberized palm pad on the grip and the forend strap both help you keep control, though full-power buckshot will still let you know it's a 12 gauge.
The 3 inch chamber handles both 2.75 and 3 inch shells, and the cylinder bore works well with buckshot and slugs at defensive distances. As with most gas-operated shotguns, standard and full-power loads cycle most reliably, so test very light target loads before counting on them. Run a few boxes of your chosen defensive load through it to confirm function.
Yes. The magazine tube extension fixture has M-LOK slots on the sides and bottom, so weapon lights and other M-LOK compatible accessories bolt right on. There's also a rear swivel stud port in the grip if you want to run a sling.
| UPC | 015813830010 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 83001 |
| Action | |
| ATF Type | Pistol Grip Firearm |
| Barrel Finish | Matte Blued |
| Barrel Length | 14.75" |
| Caliber/Gauge | 12 Gauge |
| Capacity | 5 |
| Chokes Included | Cylinder Bore |
| Color | BLUED |
| Length | 27.125'' |
| Magazine Included | 1 x 5-Round |
| Model | |
| Package Height | 2.8 |
| Package Width | 8.0 |
| Product Type | Shotgun |
| Safety | Ambidextrous |
| Shipping Weight | 7.751 |
| Sights | Fiber Optic Front |
| Sights Type | Fixed Sights |
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