Mossberg 590 12 Gauge Pump-Action, 18.5" Cyl Bore, 3" Chamber, Magpul SGA Stock & MOE M-LOK Forend, 5+1, Matte Black
This Mossberg 590 is a 12 gauge pump-action configured with Magpul SGA 590 furniture and practical accessory mounting points. It features an 18.5" cylinder bore barrel with a 3" chamber, a matte black finish, and a 5+1 capacity. Upgrades include a Magpul MOE M-LOK forend, a Magpul SGA stock set to a 12.5" length of pull, a barrel/magazine-tube clamp with QD and accessory faces, a Magpul MS1 sling, and a Velcro-backed shell card. The bore is bright and clean, and the setup emphasizes durability and utility.
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: There are markings from previous handling and use on exterior surfaces. The bore is bright and clean. Please refer to the photos for a complete view of the condition.
What's Included
- Magpul MS1 two-point sling with Magpul hardware (installed; front attached via push-button QD swivel at barrel/mag clamp)
- Barrel/magazine-tube clamp with accessory mounting faces and integrated QD socket for light attachment (installed)
- Velcro-backed elastic shell carrier card on receiver side (installed)
The 18.5" barrel is marked for a 3" chamber and Cyl Bore, making it suitable for both 2 3/4" and 3" 12 gauge shells. A single brass bead front sight provides a clear, simple aiming reference. The receiver and barrel wear a matte black finish, and the safety is the Mossberg tang-mounted design.
The stock and forend have been upgraded to Magpul components. The Magpul SGA 590 polymer buttstock offers adjustable length of pull; as configured, the LOP is 12.5". The Magpul MOE M-LOK polymer forend adds direct accessory mounting capability while maintaining a secure, grippy feel.
A barrel/magazine-tube clamp is installed and provides integrated QD and accessory mounting faces for a light, with the front of the included Magpul MS1 two-point sling attached via a push-button QD swivel at the clamp. The shotgun also features an open-ended magazine tube with a removable knurled end cap for straightforward access and service.
A Velcro-backed elastic shell card is mounted to the receiver for on-gun ammunition management. Capacity is 5+1, and the gun retains the Mossberg 590's pump-action reliability and tang safety. The barrel roll-mark notes cylinder bore and 2 3/4" and 3" chambering; it also references 590S compatibility text, but this shotgun is identified as a 590 model, not a 590S.