Remington 870 Express Super Magnum 12 Ga Pump Action Receiver — Ilion-Made, 3.5" Chamber, Buffer-Tube Adapter
This Remington 870 Express Super Magnum receiver offers the proven 870 foundation with true 3.5-inch Super Magnum capability, giving you the flexibility to run 2¾", 3", and 3½" 12-gauge shells. Built in Remington’s Ilion, NY plant before the 2020 bankruptcy, it features the solid-steel, twin-action-bar design collectors and builders trust. An aftermarket threaded adapter is already installed at the rear of the receiver, allowing immediate attachment of an AR-style buffer-tube stock for custom tactical or hunting builds.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
Specific Condition Notes: Light handling scratches and finish blemishes are visible on the receiver and magazine tube but remain purely cosmetic, with no corrosion or structural concerns.
What’s Included
- Remington Model 870 owner’s manual
This is a full-size 12-gauge Super Magnum receiver rated for 3.5" shells, making it an ideal base for heavy waterfowl, turkey, or defensive loads. Because the 870 platform indexes barrels to the receiver, you can add any compatible 12-gauge barrel to tailor length, choke, or sighting systems to your needs.
The installed threaded adapter accepts buffer-tube stocks, opening a wide range of collapsible or fixed AR-pattern stock options without additional gunsmithing. This modification also retains the original 870 cross-bolt safety and trigger group, so familiar controls remain intact.
Remington’s milled-steel receiver and twin-action-bar system are known for strength and smooth cycling. The matte black Express finish is utilitarian and easy to refinish or coat if a different aesthetic is desired. Polymer trigger guard and small-parts construction keep weight reasonable while resisting corrosion.
With its blank-slate configuration—receiver, magazine tube, and adapter only—this action is ready to accept your choice of barrel, forend, and stock, transforming into a tailored hunting gun, home-defense build, or competition setup.