Mossberg 590A1 12 Gauge Pump-Action, 20 in Heavy-Walled Cylinder Bore, 3 in Chamber, Ghost Ring Sights, 6+1
This Mossberg 590A1 pairs the model's heavy-walled 20-inch cylinder bore barrel with metal trigger guard and metal safety, giving it the core 590A1 enhancements. It features receiver-mounted adjustable ghost-ring sights, a bayonet lug, and a rugged parkerized/phosphate finish on steel components with a matte black aluminum receiver. Chambered for 2 3/4 and 3 inch shells with a stated 6+1 capacity, it is marked "M590A1" on the receiver and includes "Eagle Pass, TX" among its rollmarks.
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 exterior shows markings and significant surface rust from previous handling and use. The bore is bright and clean. See photos for details.
What's Included
- Mossberg 590/590A1 owner's manual
The 20-inch heavy-walled barrel is marked for 12 gauge and a cylinder bore, and it is chambered for both 2 3/4 and 3 inch shells. These 590A1 enhancements are complemented by a parkerized/phosphate finish on steel parts and a matte black anodized aluminum receiver, delivering a durable, duty-focused configuration.
Sight regulation is handled by a receiver-mounted adjustable ghost-ring rear paired with a barrel-mounted ramped front blade that includes an orange insert. This setup provides a clear, fast sight picture that is easy to index.
The furniture is all-black synthetic, including a fixed stock with a ventilated recoil pad and a rear swivel stud, and a ribbed corncob-style forend for positive purchase. An ambidextrous tang safety aids intuitive control, and the length of pull measures 14.5 inches.
The magazine tube extends to near the muzzle and uses a knurled clean-out style cap. A bayonet lug is fitted at the forward barrel/magazine band. The stated capacity is 6+1 rounds, and the barrel is a true cyl bore for wide-pattern performance.
Markings include a receiver rollmark of "M590A1" and a barrel legend reading "MOSSBERG - MODEL 590 - CHAMBERED FOR 2 3/4 AND 3 IN. SHELLS - 12 GA - 20 IN. - CYLINDER BORE." Additional marking includes "Eagle Pass, TX."