Mossberg 500 12 Gauge Pump-Action, 20-Inch Barrel, 6+1 Capacity, 3 Inch Chamber, Cylinder Bore, Custom Upgrades
This Mossberg 500 stands out with a focused set of functional upgrades and a clean bore. It features a 20-inch cylinder bore barrel with a perforated heat shield, a Monstrum receiver-top Picatinny rail, and a ribbed polymer forend with integral accessory rails. An aftermarket 6-position adjustable carbine-style buttstock with pistol grip is installed, along with adhesive hook-and-loop strips on the receiver and forend. It retains the proven 6+1 capacity, right-side ejection, and tang-mounted ambidextrous safety, with a chamber cut for both 2 3/4-inch and 3-inch shells.
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 some markings from previous handling and use. The bore is bright and clean. Please refer to the photos for a complete view of the condition.
What's Included
- Stock: 6-position adjustable carbine-style buttstock with pistol grip (installed)
- Forend: Polymer ribbed forend with integrated Picatinny accessory rails (installed)
- Rail: Monstrum receiver-top Picatinny rail (installed)
- Heat Shield: Perforated metal barrel heat shield (installed)
- Sling Mount: Front sling/loop hardware integrated into a barrel/magazine clamp just forward of the knurled magazine cap (installed)
- Stock: Original fixed synthetic buttstock with recoil pad (not installed)
- Shell Carrier: Allen elastic stock-mounted shell carrier sleeve (on original stock)
- Forend: Original ribbed fore-end with twin action bars assembly (not installed)
The 20-inch steel barrel uses a true cylinder bore for consistent shot patterns and is paired with a brass bead front sight. The chamber accepts both 2 3/4-inch and 3-inch shells, offering flexibility across common 12-gauge loads. A perforated metal heat shield is installed over the barrel.
The receiver is aluminum alloy with an anodized finish and a Monstrum receiver-top Picatinny rail installed. Factory markings include 'Made in U.S.A. - North Haven, Conn.' and '500 - 12 GA.' It uses right-side ejection and a tubular magazine with a knurled cap for easy maintenance.
The aftermarket furniture centers on a 6-position adjustable carbine-style buttstock with a pistol grip in black polymer. The current length of pull is 12.0 inches. The ribbed polymer forend includes integral Picatinny accessory rails, and adhesive hook-and-loop strips are applied to the receiver and forend. A front sling loop is fitted on a barrel/magazine clamp just forward of the knurled magazine cap.
Controls are straightforward and familiar to Mossberg users, with a tang-mounted, ambidextrous safety and a bead front sight. This example also includes the original fixed synthetic buttstock with recoil pad and the original ribbed fore-end with its twin action bars assembly, offering options to configure the shotgun to preference.