This is the Mossberg 590S Shockwave (model 51600), a 12-gauge pump pistol-grip firearm with a 3" chamber and an 18.5" matte blued cylinder-bore barrel with a bead front sight. As a 590S, it cycles 1.75", 2.75" and 3" shells interchangeably, even mixed in the tube, with no adapter. The tube holds 5 shells of 3", 6 of 2.75" or 9 of 1.75". It has the Raptor bird's-head grip, a black corn-cob forend with a strap, a top-mounted ambidextrous safety, dual extractors and twin action bars. Listed specs are 30.75" overall length and 5.5 lbs.

In stock at Custom Defense Solutions USA in Littleton, MA.

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