Mossberg 940 SPX Shotgun 12ga 3" Chamber 7rd Capacity 18.5'' Barrel FDE Finish

The Mossberg 940 SPX is a semi-automatic tactical shotgun built for serious shooters who demand modern features without compromise. This 12-gauge autoloader runs on Mossberg's proven gas-vent system and feeds reliably from its 7+1 capacity magazine tube, making it equally at home on the duty line, in competition, or for home defense. The 18.5" barrel with Cerakoted Flat Dark Earth finish delivers a compact platform that doesn't sacrifice performance, while the 3" chamber handles standard and magnum shells seamlessly.

What sets the 940 SPX apart is its forward-thinking optics integration. The receiver ships optic-ready with a Shield RMSc footprint already mounted, plus three additional adapter plates that let you run RMR, Docter, or Leupold footprint optics—giving you real flexibility to dial in your preferred red dot. Built-in fiber optic ghost ring sights serve as a fast, reliable backup. The forend brings the heat with an integrated shield, multiple M-Lok slots for lights and accessories, and quick-detach ports so you're not locked into one configuration. Up front, a Vang Comp 6-shotshell carrier keeps extra rounds immediately accessible.

The ergonomics matter too. An oversized safety and bolt release make operation fast and sure, even with gloved hands. The adjustable length-of-pull stock (12.5" to 14.25") fits different body types and shooting styles, and QD ports on the stock let you swing on a sling in seconds. The drilled and tapped receiver opens the door to even more customization down the line. Mossberg equipped it with a cylinder bore choke from the factory, giving you a wide spread pattern right out of the box.

The 940 SPX strikes a smart balance: modern tactical features, proven Mossberg reliability, and the weight (7.25 lbs) and length (37") that make it genuinely manageable in tight quarters. It's not trying to be everything to everyone—it's designed for the shooter who knows what they want in a modern semi-auto shotgun.

Key Features

• Semi-automatic gas-vent system for reliable cycling with 2.75" and 3" shells
• Optic-ready receiver with Shield RMSc footprint and three additional mounting adapters (RMR, Docter, Leupold compatible)
• Fiber optic ghost ring sights with metal construction for backup aiming
• Integrated heat shield on forend with M-Lok accessory slots and quick-detach ports
• Vang Comp 6-shotshell carrier for fast reloads
• Cerakoted barrel and receiver in Flat Dark Earth finish
• Adjustable length-of-pull stock (12.5" to 14.25") with QD attachment points
• Oversized ergonomic safety and bolt release for fast operation
• Drilled and tapped receiver for future customization
• Cylinder bore choke installed; compatible with Mossberg Accu-Choke system

Specifications

Frequently Asked Questions

What optics can I mount on the 940 SPX?

The receiver comes equipped with a Shield RMSc footprint base. The shotgun includes three additional adapter plates in the box so you can switch between RMR, Docter, and Leupold footprint optics depending on your preference. This gives you flexibility to choose your favorite red dot without buying extra hardware.

Does the 940 SPX come with sights if I don't mount an optic?

Yes. It features built-in fiber optic ghost ring sights with metal construction, so you have a fast, reliable backup aiming solution even if you never mount a red dot. The fiber optic front sight pairs with a metal rear ghost ring for quick target acquisition.

Is the 940 SPX suitable for home defense?

The 18.5" barrel, compact overall length of 37", and semi-automatic reliability make it a practical choice for home defense. The 7+1 capacity, fast controls, and ability to mount a light via M-Lok or quick-detach ports support a defensive setup. It handles both standard 2.75" and 3" magnum shells seamlessly.

Can I adjust the stock length?

Yes. The adjustable length-of-pull stock ranges from 12.5" to 14.25", so you can dial in the fit for your frame and shooting style. The stock also features quick-detach ports for mounting a sling.