Mossberg 590 Shockwave 20 Gauge Pump-Action, 14.375 Inch Barrel, Matte Black, Cylinder Bore
This Mossberg 590 Shockwave is a compact 20 gauge pump-action with a 14.375 inch cylinder bore barrel, chambered for 2 3/4 or 3 inch shells. It features the black synthetic bird's-head grip and ribbed polymer forend with hand strap that define the Shockwave format, along with a matte black finish and brass bead front sight. The receiver is drilled and tapped with four plug screws, and the gun is made in the USA.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: There are a few light handling marks and some scattered surface scratches.
What’s Included
- Mossberg-branded cardboard box (non-original to this firearm; labeling carries different information than this firearm)
The 14.375 inch cylinder bore barrel is set up with a simple bead sighting system: a brass bead front and no rear sight. Chambering accommodates both 2 3/4 and 3 inch 20 gauge shells. The smoothbore interior presents cleanly, matching the noted bore condition.
Controls and furniture include a top-tang sliding safety with a red 'fire' indicator, a black synthetic bird's-head grip, and a ribbed polymer forend with an integral hand strap. A polymer trigger guard and matte black metal finish complete the package.
The receiver is drilled and tapped and comes fitted with four plug screws. A full-length magazine tube is capped by a knurled front cap, and a forward sling eyelet is integrated at the front. This configuration follows the practical 590 layout in a compact Shockwave format.
Built in the USA, this example presents with light handling evidence consistent with the stated condition. A Mossberg-branded cardboard box is included; it is not the original box for this firearm and its exterior information does not match this gun.




