Mossberg 590S Shockwave 12 Gauge Pump Action Pistol Grip Firearm – 18.5″ Barrel

The Mossberg 590S Shockwave is a compact, non-NFA pistol grip firearm built on Mossberg’s battle-proven 590S platform. Chambered in 12 gauge with a 3-inch chamber, it accepts 1¾-inch, 2¾-inch, and 3-inch shells interchangeably, giving it remarkable versatility in a highly maneuverable package. With an 11-round capacity and a 32.7-inch overall length, this is a serious tool for home defense and close-quarters use.

Key Specifications

• The gauge is 12 Gauge with a 3-inch chamber capacity.
• The barrel measures 18.5 inches with a matte blued finish.
• The overall length is 32.7 inches, keeping the platform compact and easy to handle.
• Total capacity is 10+1 rounds via an integrated tubular magazine.
• The action is a pump action, delivering reliable cycling regardless of load selection.
• The ATF classification is a Pistol Grip Firearm, requiring no NFA registration.
• The safety is an ambidextrous top-tang design for fast, intuitive operation from either hand.
• Sighting is handled by a fixed bead front sight for quick target acquisition.
• The choke is a cylinder bore, optimized for close-range performance.
• The synthetic Raptor pistol grip and forend provide a durable, no-snag profile.

The 590S Shockwave punches well above its weight class. The 590S action’s multi-shell compatibility means you can run low-recoil mini shells for higher capacity or full-power 3-inch loads without changing anything—the platform handles it all. The ambidextrous tang safety and matte blued finish reflect Mossberg’s no-compromise approach to functional design. If you need a compact, high-capacity 12 gauge that stays off the NFA registry and earns its keep in the real world, the 590S Shockwave delivers.