Mossberg 590A1 12 Gauge Pump-Action, 20 in Heavy-Walled Barrel, 8+1, Ghost-Ring Sights, Heat Shield, Picatinny Rail, Bayonet Lug with OKC M9 Bayonet
This Mossberg 590A1 stands out with a 20-inch heavy-walled, cylinder-bore barrel, extended 8+1 capacity, and a drilled-and-tapped receiver with a Picatinny rail installed. It retains the correct military-style features including a perforated steel heat shield and a bayonet lug, and it comes with an Ontario Knife Company M9 bayonet. Notably, the receiver is marked "M590A1" while the barrel is stamped "Model 590," adding a detail collectors and enthusiasts will appreciate.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Fouling: Mild Fouling - Light buildup of fouling or dirt.
Specific Condition Details: The receiver and barrel show minor and superficial scratches and blemishes. The bore shows some plastic fouling from shotcup wads but remains smooth and shiny.
What's Included
- Ontario Knife Company M9 bayonet
- M9 bayonet scabbard
The 590A1 configuration here features a 20-inch heavy-walled, cylinder-bore barrel paired with an extended magazine tube that runs to the muzzle for a 9-shot (8+1) capacity. A barrel/magazine clamp is fitted for added rigidity, and the perforated steel heat shield provides additional protection over the barrel.
Sighting equipment is purpose-built: an adjustable ghost-ring rear sight teams with a protected blade front fitted with a red fiber-optic insert for quick acquisition. The receiver is drilled and tapped, and a Picatinny rail is installed for mounting as needed.
The furniture is durable synthetic with a ribbed fore-end for positive purchase and a fixed stock finished in black. A Mossberg factory rubber buttpad is installed, and the stock provides a 14.25 in length of pull. A rear sling stud is present.
Controls and construction reflect the 590A1 lineage, including an ambidextrous tang safety and an aluminum receiver finished in matte black. Origin is the United States. This M590A1 has the bayonet lug attached and is compatible with U.S. M7/M9 pattern bayonets; an appropriate OKC M9 bayonet is included.
Markings include "M590A1" on the receiver and "Model 590" on the barrel, an as-described pairing that underscores this specific gun’s configuration and provenance.