Mossberg 500 Tactical Tri-Rail Forend 12 Gauge Pump-Action, 18.5 in Cylinder Bore, ATI Telescoping Stock, 5+1, Matte Black, 6 round shell holder affixed to stock
This Mossberg 500 Tactical Tri-Rail Forend model is a purpose-built 12 gauge with an 18.5 in cylinder bore barrel, brass bead front sight, and a robust aluminum alloy receiver. It is outfitted with an ATI-marked 6-position telescoping stock, a polymer tri-rail forend, and a 6 round shell holder affixed to stock that expand practical capacity. The receiver is marked Made in USA, North Haven, Conn, and the factory box label lists part number 50421 with a pack date of 6/30/2013.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: The matte blued finish is clean with a faint wear line on the magazine tube. The dual-action bar pump mechanism cycles smoothly. The ambidextrous top-mounted safety is crisp and functional.
What’s Included
- Mossberg factory box with item 50421 label
- Original Mossberg owner's manual
- Cable lock
- ATI adjustable telescoping stock with pistol grip (installed)
- Tri-rail forend with Picatinny rail sections, PR-MO marked (installed)
- Black adjustable sling with bungee section (installed)
- 6 round shell holder affixed to stock (installed)
- Under-barrel 6-shell caddy on barrel/magazine clamp (installed)
- Barrel/magazine clamp with integrated Picatinny accessory rail (installed)
- Pair of vented polymer side panels for tri-rail forend (not installed)
The 18.5 in cylinder bore barrel and brass bead front sight provide a straightforward, quick-handling setup. The aluminum alloy receiver wears a matte black finish and is drilled and tapped on top with three filler screws. The action is the proven Mossberg pump with dual action bars and an ambidextrous tang safety.
The polymer tri-rail forend provides bottom and side Picatinny sections for accessory mounting, and is PR-MO marked. A barrel/magazine clamp adds an additional Picatinny rail, expanding mounting options.
An ATI-marked 6-position telescoping stock with pistol grip and rubber recoil pad tailors fit and control. Length of pull is adjustable to approximately 11–15 inches, and the black synthetic furniture complements the shotgun’s matte finish.
This configuration supports 2-3/4 in and 3 in shells, with a factory-rated 5+1 capacity using 2-3/4 in shells. Onboard shell management is enhanced with a 6 round shell holder affixed to stock and an under-barrel 6-round caddy. The receiver rollmark indicates Made in USA, North Haven, Conn, and the factory box label shows part number 50421 (Tactical STK and TRI-RAIL F/E) with a pack date of 6/30/2013.