Mossberg 990 SPX
O.F. Mossberg & Sons · Shotgun · In Production · 2025
Also known as: 990 SPX, 990 SPX Magpul, Mossberg 990
Overview
The Mossberg 990 SPX is a gas-operated semi-automatic 12-gauge tactical shotgun representing Mossberg's newest semi-auto platform. Built around a smooth-running gas-vent operating system, the 990 SPX ships with a Magpul SGA adjustable stock with spacers for length-of-pull adjustment from 12 to 14 inches. The 18.5-inch barrel features an integrated heat shield forend with M-LOK accessory slots and QD sling ports for versatile mounting options. The receiver is optic-ready with an RMSc-pattern cut and includes three adapter plates for mounting RMR, Docter, and Leupold micro dots. Metal ghost ring rear and fiber optic front sights provide reliable co-witness capability. An oversized ergonomic safety with red indicator and oversized bolt release enhance tactical handling.
Specifications
| Weight (empty) | 3515 g (124.0 oz) |
| Overall Length | 946 mm (37.24") |
| Barrel Length | 470 mm (18.50") |
| Action Type | Gas Operated |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 7 rounds |
| Magazine Type | Tubular |
| Effective Range | 40 m (44 yd) |
| Barrel Rifling | Smoothbore |
| Frame Material | Aluminum |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Matte Blue |
Calibers
- 12 Gauge · primary — also known as 12 ga, 12 bore
Features
- Firing modes: Semi Automatic
- Feed systems: Tubular Magazine
- Safety mechanisms: Tang Safety
- Features: Gas Vent Operating System, Magpul Sga Adjustable Stock, Integrated Heat Shield Forend, M Lok Slots, Qd Sling Ports, Optic Ready Rmsc Pattern, Metal Ghost Ring Rear Sight, Front Fiber Optic Sight, Accu Choke System, Oversized Safety, Oversized Bolt Release, 3 Inch Chamber, Adapter Plates For Rmr Docter Leupold
Variants
Service history
Operators
- United States Civilian Market · adopted 2025
- United States Law Enforcement (various agencies)
Production
Production years: 2025-present
Mossberg's newest semi-auto platform, introduced at SHOT Show 2025
Origin
Country of origin: United States
Notes
The 990 represents Mossberg's next-generation semi-auto tactical platform, positioned above the 940 Pro series. The gas-vent operating system is designed for reliable cycling of both light and heavy 12-gauge loads through a 3-inch chamber. A Class 3/NFA variant with 14.75-inch barrel (5+1 capacity) is also available. The 990 SPX ships standard with the Magpul SGA stock and integrated heat shield forend - premium features that are aftermarket upgrades on competing platforms. MSRP: $1,309. Overall length: 37.25" (946mm). Weight: 7.75 lbs (3515g).
Background
The Mossberg 990 SPX arrived in 2025 as the company's most premium semi-automatic tactical shotgun, building on lessons learned from the 930 and 940 Pro platforms. Its partnership with Magpul for the factory SGA stock and integrated heat shield forend signaled Mossberg's intent to compete directly with premium tactical semi-auto shotguns from Benelli and Beretta.