Mossberg 590A1 12 Gauge Pump-Action, 20.5 in Cylinder Bore, 3 in Chamber, Ghost-Ring Sights, 6+1 Capacity
This Mossberg 590A1 stands out with its 20.5-inch cylinder-bore barrel, 3-inch chamber, and factory ghost-ring sight system. It features an LPA Italy adjustable rear sight mounted on a receiver Picatinny rail and a wing-protected front post with a colored insert. The shotgun has a full-length magazine tube for 6+1 capacity, rugged black synthetic furniture, and U.S. roll-markings that document its configuration.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: The metal and furniture display handling marks from previous use. The bore is bright and clean. Refer to the photos for a closer look at the surfaces and markings.
What’s Included
- Mossberg 590A1 12 gauge pump-action shotgun
- Receiver-mounted Picatinny rail with LPA Italy adjustable ghost-ring rear sight
- Wing-protected front post with colored insert
- Fixed black synthetic buttstock with ventilated recoil pad
- Full-length magazine tube with front cap sling-swivel stud
- Rear sling-swivel stud at the stock toe
The 590A1 configuration here pairs a 20.5-inch barrel with a true cylinder bore (cyl choke), giving a straight-through, choke-free profile. The chamber accepts both 2 3/4-inch and 3-inch shells, and the full-length magazine tube provides 6+1 capacity.
The sighting system is a highlight: an LPA Italy adjustable ghost-ring rear sight is mounted to the receiver’s Picatinny rail, matched with a wing-protected front post that carries a colored insert. This setup offers a precise, durable iron-sight arrangement built into the gun.
The shotgun wears black synthetic furniture, including a fixed stock with a ventilated recoil pad and a ribbed/corncob polymer forend. The tang safety sits at the top rear of the receiver for familiar Mossberg operation. Factory sling-swivel studs are installed at the front cap and at the stock toe.
Finish is matte black overall, with the barrel and magazine tube showing a matte gray-black tone and the receiver and furniture in black. Markings include M590A1 on the receiver; model, gauge, chamber lengths, barrel length, and cylinder bore on the barrel; “Mossberg North Haven, CT U.S.A.” at the loading port; and an “Eagle Pass, TX USA” barrel warning. Country of origin is the United States.