Following the success of the 590 Shockwave 12-gauge pump-action firearm (see Gun Tests‘ 2017 Guns of the Year), Mossberg has released a 20-gauge version (50657) of the 590 Shockwave, priced at $455 MSRP. Featuring a 14-inch barrel, “birds head” pistol grip and an overall length of 26.4 inches, the 590 Shockwave does not fall under the purview of the National Firearms Act (NFA) and does not require additional paperwork or the payment of a tax stamp for transfers. Federal Law does require the purchaser of this firearm to be 21 years of age. The 20-gauge versions are already in production and shipping to wholesalers, according to Mossberg.
Based on the 590 pump-action design, the 20-gauge version of the Shockwave required an engineering redesign as this is the first time that Mossberg has offered the 590 platform in a smaller gauge. In addition to a scaled-down receiver, the cob-styled, tactical forend was reduced in overall size. Weighing in at 4.95 pounds, this compact 20-gauge firearm utilizes Mossberg’s pump-action platform and fitting it with the Raptor pistol grip from Shockwave Technologies; strapped forend for safe, controlled handling; and 6-round capacity.
At the core of the 590 Shockwave are non-binding twin action bars, positive steel-to-steel lock-up, an anti-jam elevator, dual extractors, and an ambidextrous top-mounted safety. The lightweight receiver is constructed of anodized aluminum and is drilled and tapped for ease of adding an optic or accessories. The magazine tube features a clean-out cap. This 20 gauge is chambered for 3-inch shotshells with a six-round capacity. The 14-inch heavy-walled barrel with Cylinder choke is topped with a bead sight and sports a matte-blue finish. Rear and magazine-cap sling swivel studs complete the package.