Mossberg 590M Shockwave shotgun, 12-gauge, pump-action
(Photo by Mossberg)

Mossberg’s popular Shockwave platform just got a long-anticipated upgrade with the new 590M Shockwave model — a mag-fed version of the original Shockwave.

Mossberg first unveiled its non-NFA Shockwave firearm platform in 2017. Classified by the BATFE (Bureau of Alcohol, Tobacco, Firearms and Explosives) as a “Non-NFA Firearm,” the Shockwave requires no tax stamp for transfers.

While featuring the same Shockwave Technologies Raptor pistol grip as the original model, the Shockwave 590M has a few differences. The new model features a slightly longer 15-inch barrel and a slightly heavier weight at 6.55 pounds.

However, the biggest difference is the capacity. The 12-gauge firearm features world’s first double-stack, 10-round shotgun magazine; this offers 10+1 capacity. For greater versatility, optional 5-, 10-, 15- and 20-round capacity magazines are sold as accessories.

Mossberg 590M Shockwave Details

At the core of the 590M Shockwave are the magazine’s integral stabilizing ribs, which engage the magazine directly to notches machined into the receiver, ensuring a positive lock-up.

The all-steel, heated-treated magazine release button and housing are optimally positioned in front of the trigger guard for convenient, ambidextrous access for unloading and reloading. The location of the mag release does not interfere with cycling of the action. The design allows for proper balance with a full-magazine located at the center of gravity point.

The 590M design features a patented double-stack magazine constructed with hardened-steel feed lips, over-molded steel shell ramps and an anti-cant, rounded follower to ensure reliable feeding.

Additional features include an easy-grip, molded external shell; proprietary self-lubricating polymer magazine body; heavy-duty ASTM-A-228 music-wire magazine spring for prolonged service life; removable floor plate for ease of cleaning; and durable black oxide finish on the steel components.

Shockwave Foundations

Based upon Mossberg’s proven pump-action platform, standard features of the 590M Shockwave include non-binding twin action bars; positive steel-to-steel lock-up; dual extractors; anodized aluminum receiver drilled and tapped for convenience of adding optics; 15-inch heavy-walled barrel; convenient cleanout magazine tube; and universally recognized, ambidextrous top-mounted safety.

The Shockwave Technologies Raptor pistol grip features an enhanced textured finish and has a “bird’s head” shaped-profile, allowing for maximum control while minimizing felt recoil. The grip is constructed of durable, glass-filled polymer with non-reflective, black finish and has an overall length of 5.25 inches.

Completing the furniture package for the 590M Shockwave is the cob-styled, tactical forend. The forend is strapped for greater control and smoother operation.

NFA Classification

By definition, the Shockwave platform is a “firearm” under the Gun Control Act of 1968 (GCA), and is not subject to the provisions of the National Firearms Act (NFA), although state and local laws may be more restrictive.

To read a copy of the letter from the BATFE regarding federal classification of the Shockwave or more information on Mossberg’s family of Shockwave firearms, including the 590M Shockwave, please visit Also, be sure to check out Tactical Life’s complete review of the original Mossberg 590 Shockwave.

Mossberg 590M Shockwave Specifications

  • Type: 590M; Non-NFA Pump-Action
  • Gauge/Chamber: 12 Gauge / 2.75 inches
  • Capacity: 11
  • Barrel/Finish: 15-inch Heavy Walled; Matte Blue
  • Sights: Bead
  • Chokes: Cylinder Bore
  • Overall Length: 27.5 inches
  • Forend/Stock/Finish: Shockwave Raptor Grip; Cob Forend with Strap; Black Synthetic
  • Approximate Weight: 6.55 pounds
  • MSRP: $721

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