Mossberg 590A1 12 Gauge Pump-Action, 20 in Cylinder-Bore Barrel, Ghost Ring Sights, Heat Shield, Receiver Picatinny Rail, Bayonet Lug — Includes Ontario M9 Bayonet
This Mossberg 590A1 stands out with its 20 inch cylinder-bore barrel (roll-marked “MOSSBERG — MODEL 590 — 12 GA — 20 IN. — CYLINDER BORE”), factory heat shield, and robust sighting system featuring an LPA ghost-ring rear on a receiver Picatinny rail and a winged red fiber-optic front sight. It follows the 590A1 lineage, the only pump-action shotgun to pass U.S. MIL-SPEC 3443 testing. The tubular magazine stops short of the muzzle and includes a clean-out end cap, and this example includes an Ontario Knife Co.
M9 bayonet with scabbard.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Specific Condition Notes: The firearm is in solid shape with various cosmetic imperfections, scratches, blemishes, and areas of finish loss consistent with prior handling. The bore remains clean and shiny.
What's Included
- Original manual
- Cable lock
- Ontario Knife Co. M9 bayonet with scabbard
The 20 inch barrel uses a cylinder bore and is fitted with a factory heat shield. The magazine tube stops short of the muzzle and is equipped with a clean-out end cap. Factory capacity is 5+1.
Sighting is set up for fast alignment and durability: a winged red fiber-optic front sight pairs with an LPA ghost-ring rear mounted on a receiver Picatinny rail. The rail provides a solid mounting base for the rear sight assembly.
Controls and furniture are purpose-built. The ambidextrous tang safety is easy to access. The black synthetic fixed stock includes a recoil pad and rear sling swivel, while the ribbed synthetic forend offers a secure grasp.
The 590A1 lineage is the only pump-action shotgun to pass U.S. MIL-SPEC 3443 testing. This model features an aluminum receiver and a bayonet lug assembly with a front sling swivel. It is chambered for both 2 3/4 inch and 3 inch 12-gauge shells.
Made in the United States, this pump-action configuration with its receiver rail, ghost-ring sights, and bayonet lug reflects the proven 590A1 feature set in a durable, straightforward package.