Mossberg 590A1 12 Gauge Pump-Action, 18.5 inch Heavy-Walled Accu-Choke Barrel, Ghost-Ring Sights, Magpul SGA Stock, M-LOK Forend, 3 inch Chamber, Cylinder Choke
This Mossberg 590A1 pairs the model’s proven, heavy-walled 18.5 inch barrel and mil-spec lineage with practical upgrades for control and accessory mounting. It features an Accu-Choke threaded barrel set up with a cylinder choke, a 3 inch chamber for 2 3/4 and 3 inch shells, and a factory ghost-ring sight set. A Magpul SGA stock with spacer-adjustable length of pull and a polymer M-LOK forend are installed, along with a barrel/magazine clamp that integrates a short Picatinny rail segment near the muzzle.
The receiver is marked "M590A1," and the barrel is marked "MOSSBERG CHAMBERED FOR 2 3/4 AND 3 IN SHELLS — 12 GA. 18 1/2 IN. ACCU-CHOKE" and "MOSSBERG NORTH HAVEN, CT U.S.A. 590 12 GA." The shotgun retains hallmark 590A1 features including the heavy-walled barrel, metal safety and trigger guard, and a clean-out magazine tube. Capacity is 6 rounds.
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 Rifling: Smoothbore - No rifling present.
Light handling marks are present from prior use. Please refer to the photos for a close look.
What’s Included
- Magpul SGA 500 polymer buttstock (installed)
- Fixed synthetic buttstock (spare/off-gun)
- Fenix ALG-00 flashlight ring mount
- Long magazine spring
- M-LOK rail cover panels
- Barrel/magazine clamp with short Picatinny rail segment (installed)
- Assorted small accessories (as pictured)
The 18.5 inch Accu-Choke threaded barrel is configured with a cylinder choke (Cyl Cho), giving this 590A1 a versatile, defense-oriented setup. The chamber is 3 inch and accepts both 2 3/4 and 3 inch shells, clearly noted on the barrel markings.
Factory ghost-ring sights consist of a ramped front blade with an orange insert and an adjustable ghost-ring rear. This sighting system is fast to acquire and provides a precise sight picture on the heavy-walled barrel.
The shotgun reflects 590A1 lineage with a metal safety and trigger guard, and a clean-out magazine tube. The receiver is marked "M590A1" and wears a matte black/grey finish consistent with the barrel and furniture.
Ergonomics are enhanced by the Magpul SGA stock and polymer M-LOK forend. The SGA stock uses a spacer system for length-of-pull tuning; it is currently set to approximately 13.5 inches. The barrel/magazine clamp includes a short Picatinny rail segment near the muzzle, and a Fenix ALG-00 flashlight ring mount is included. Capacity is 6 rounds.