The Mossberg 590 Shockwave in 20 gauge (brand part no. 50657) is a pump-action firearm built around a 14.375-inch barrel with a 3-inch chamber, finished in blued steel and equipped with a bird’s-head grip rather than a shoulder stock, keeping it factory-classified as a standard firearm rather than a regulated short-barreled shotgun. Mossberg tops the Shockwave with a front bead sight and an ambidextrous safety for fast, intuitive operation. Among pump shotguns in the pump action shotguns category, the 590 Shockwave favors shooters who want a maximally compact 20 gauge pump for close-range defense.

Key Specifications

• Chambered in 20 gauge with a 3-inch chamber.
• Operates as a pump-action firearm.
• Features a 14.375-inch barrel.
• Feeds from a tubular magazine with a 5+1 capacity.
• Runs a cylinder choke.
• Equipped with a front bead sight.
• Runs an ambidextrous safety.
• Finished in blued steel.
• Ships without a shoulder stock, using a bird’s-head grip.
• Overall length is 33 inches.
• Ships at approximately 6.7 pounds.

Frequently Asked Questions

Is this an NFA-regulated item? No. The Shockwave ships from the factory with a bird’s-head grip instead of a shoulder stock, which keeps it classified as a standard firearm.

What is the magazine capacity? A 5+1 capacity tubular magazine.

Buy the Mossberg 590 Shockwave 20 Gauge

A maximally compact 20 gauge pump for close-range defense is exactly what the 590 Shockwave delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.