Mossberg 500 ATI Scorpion 12 Gauge Pump-Action, 18.5" Barrel, 5+1, Adjustable Stock, Rails, Heat Shield – Matte Black
The Mossberg 500 ATI Scorpion pairs the proven 12 gauge 500 action with ATI tactical furniture and accessories. This setup includes an adjustable stock with pistol grip, a receiver-top Picatinny rail with integrated shell carrier, a tri-rail fore-end clamp, and a vented heat shield. It is chambered for 2-3/4" and 3" shells, features an 18.5" barrel, and carries clear North Haven, CT receiver markings. Condition is excellent, with only faint signs of prior handling.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: Minor, superficial scratches and blemishes are present on the exterior surfaces.
What’s Included
- Mossberg pump-action shotguns owner's manual
- ATI receiver-top shroud with Picatinny rail and 4-round shotshell carrier (installed)
- Vented barrel heat shield/shroud (installed)
- Tri-rail fore-end clamp with Picatinny sections at 3, 6, and 9 o'clock (installed)
- ATI adjustable synthetic shoulder stock with recoil pad (installed)
- Additional shell saddles
This ATI Scorpion configuration adds capability to the classic Mossberg 500 platform. The receiver-top Picatinny rail allows mounting of optics, and the ATI shroud integrates a 4-round shell carrier for quick access. A tri-rail fore-end clamp provides additional mounting points at 3, 6, and 9 o'clock for lights or accessories, and a vented heat shield protects the support hand during extended use.
The 18.5" steel barrel, standard-length magazine tube, and 5+1 capacity keep the package compact and maneuverable. It is chambered for both 2-3/4" and 3" 12 gauge shells, offering broad ammunition flexibility. The aluminum receiver carries factory markings reading "MOSSBERG – NORTH HAVEN, CT U.S.A." and "500 12 GA."
ATI's adjustable synthetic stock features a recoil pad and pistol grip, with a gray/black finish that matches the polymer forend. The adjustable length of pull ranges from 12.25" to 15.75", helping tailor the fit to the shooter or application. The gray synthetic forend includes a textured panel for a positive grasp.
Sighting is straightforward with a brass bead front plus a protective front sight wing; no rear sight is present. The firearm wears a uniform matte black finish over the metalwork, while the furniture contrasts in gray/black. Overall, this is a well-appointed, U.S.-made 500 configured for accessory mounting and fast handling.