The Mossberg 590S Shockwave in 12 gauge (brand part no. 51600) is a pump-action firearm built around an 18.5-inch barrel with a versatile 3-inch chamber that also cycles 2.75-inch and 1.75-inch mini shells. Mossberg equips the 590S with a Raptor grip, corn-cob forend and strap, a bead sight, and a Cylinder Bore choke. Because it ships without a shoulder stock, the 590S Shockwave is classified by the ATF as a firearm rather than a shotgun; no NFA paperwork or tax stamp is required, only a standard FFL transfer. Among pump-action shotguns in the pump-action shotguns category, the 590S favors shooters who want multi-shell versatility with the Shockwave’s compact footprint.

Key Specifications

• Chambered in 12 gauge with a versatile 3-inch chamber.
• Cycles 1.75-inch, 2.75-inch, and 3-inch shells.
• Operates as a pump-action firearm.
• Features an 18.5-inch barrel.
• Overall length is 30.75 inches.
• Feeds from a tubular magazine with a 9-round capacity.
• Runs an ambidextrous top-tang safety.
• Fitted with a Raptor grip and corn-cob forend with strap.
• Includes a Cylinder Bore choke.
• Classified by the ATF as a firearm, not a shotgun, due to its lack of a shoulder stock.

Frequently Asked Questions

What shell sizes can it cycle? 1.75-inch mini shells, 2.75-inch standard shells, and 3-inch magnum shells.

Does this require a tax stamp? No, it ships with a standard FFL transfer; it is classified as a firearm rather than a shotgun, but no NFA paperwork is required.

Buy the Mossberg 590S Shockwave 12 Gauge

Multi-shell versatility with the Shockwave’s compact footprint is exactly what the 590S delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.