Mossberg 590A1 12 Gauge Pump-Action Shotgun, 20-inch Cylinder-Bore Barrel, Ghost-Ring Sights, 8+1 Capacity, Magpul MOE M-LOK Forend, Receiver-Top Picatinny Rail
This Mossberg 590A1 stands out with a 20-inch cylinder-bore barrel, robust ghost-ring sight system, and an 8+1 tubular magazine. The receiver is roll-marked “M590A1,” while the installed 20-inch cylinder-bore barrel is roll-marked “Model 590.” It features a receiver-top Picatinny rail with an XS Sights rear aperture, a wing-protected front post, and a Magpul MOE M-LOK forend. An added magazine-tube clamp with a QD sling socket expands sling options, and the adjustable stock is currently set to a 13-inch length of pull.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: This firearm is in good shape. There are some minor and superficial scratches and blemishes present. The bore is clean and shiny.
What’s Included
- Mossberg 590A1 12 Gauge pump-action shotgun; installed 20-inch cylinder-bore barrel is stamped “Model 590”
- Receiver-top Picatinny rail with XS Sights ghost-ring rear aperture and wing-protected front post
- Magpul MOE M-LOK polymer forend
- Polymer stock with adjustable length of pull (set to 13 inches)
- Additional magazine-tube clamp with QD sling socket
The 20-inch cylinder-bore barrel keeps handling straightforward and consistent, and the tubular magazine holds 8+1 rounds with 2 3/4-inch shells. The shotgun is chambered for both 2 3/4 and 3-inch shells. Dual action bars and a tang-mounted safety with a red FIRE dot indicator round out the core controls.
The sighting system is set up with a receiver-top Picatinny rail and an XS Sights ghost-ring rear aperture paired with a wing-protected front post. The ghost-ring arrangement provides a clear, fast sight picture, and the protected front post is designed for durability.
The Magpul MOE M-LOK polymer forend offers M-LOK slots for attaching compatible accessories. The polymer stock features an adjustable length of pull and is currently set to 13 inches, accommodating a compact, ready fit.
Hardware details include a bayonet lug integral to the front sight and magazine hanger, plus sling provision via the QD socket on the added magazine-tube clamp. The matte black/gray finish and dark gray/black receiver present a purposeful, low-glare appearance. Made in the United States.