The 990 AfterShock: Compact Design, Exceptional Tactical Functionality. This ultra-compact firearm is engineered for easy handling, featuring a 5+1 semi-automatic capacity along with a suite of tactical enhancements. Inside, the 990 is built with a durable gas system and corrosion-resistant internal components (including a nickel boron-coated gas piston, magazine tube, hammer, and sear), as well as an enlarged loading port, an elongated elevator, and an anodized follower for reliable performance. On the outside, it boasts an ergonomically shaped AtterShock grip with a rubberized palm pad, a streamlined forend with Mossberg's signature texturing, and an embossed strap for a secure grip. Furthermore, the magazine tube extension is equipped with M-LOK mounting slots on the sides and bottom, providing versatile options for accessories.
| Model | 990 |
| Type | Pistol Grip Firearm |
| Caliber | 12GA |
| Manufacturer | Mossberg |