The Mossberg 590 Shockwave is a compact, pump-action firearm classified by the ATF as a pistol grip firearm — not a shotgun — making it legal to own in most states without the restrictions that apply to short-barreled shotguns. Built on Mossberg’s proven 590 platform, it delivers reliable 12-gauge performance in a highly maneuverable 33-inch overall package suited for home defense, vehicle storage, or range use. The blued steel barrel and synthetic construction keep it rugged and low-maintenance.
Key Specifications
- Chambered in 12 Gauge with a 3-inch chamber for versatile shell compatibility.
- The barrel measures 14 inches with a blued finish for corrosion resistance.
- Overall length is a compact 33 inches, optimized for tight-quarters handling.
- Capacity is 5+1 rounds via a tubular magazine.
- Action is pump action, proven for reliability across a wide range of ammunition types.
- ATF classification is Pistol Grip Firearm, distinct from a short-barreled shotgun under federal law.
- Safety is ambidextrous, accommodating both left- and right-handed users.
- Sighting system features a front bead fixed sight for fast target acquisition.
- Ships with a Cylinder (C) choke installed for an open, wide-pattern spread.
- Shipping weight is approximately 6.95 pounds.
The 590 Shockwave has earned its reputation as one of the most practical and legally accessible compact firearms on the market. Whether you’re looking for a capable home-defense option with a minimal footprint or a range conversation piece that’s genuinely fun to shoot, Mossberg’s build quality and the 590’s track record speak for themselves. If you want maximum 12-gauge capability in a platform that doesn’t require NFA registration, the Shockwave delivers.






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