Remington 870 Express Magnum 20 Gauge Pump-Action, 21" Vent Rib, Knoxx SpecOps Adjustable Pistol-Grip Stock, 6+1 Capacity
This 20-gauge Remington Model 870 Express Magnum stands out with a 21" ventilated-rib barrel, chambers for both 2 3/4" and 3" shells, and installed upgrades for extended capacity and adjustability. It features a Knoxx Industries SpecOps adjustable pistol-grip stock, a magazine tube extension with barrel/mag clamp for a stated 6+1 capacity, and a matte black steel receiver marked "870 EXPRESS MAGNUM."
The pump-action system uses dual action bars with a polymer forend and a single front bead sight on the rib. A cross-bolt safety behind the trigger and the durable matte black finish round out a straightforward, functional configuration made in the USA.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Fouling: Mild Fouling - Light buildup of fouling or dirt.
Specific Condition Notes: The firearm is in solid functional shape. The exterior shows scratches and blemishes.
What's Included
- Remington Model 870 Pump Action Shotgun instruction book
- Knoxx SpecOps Stock owner's manual
- Nylon sling
- Knoxx Industries SpecOps adjustable pistol-grip buttstock (installed)
- Magazine tube extension with barrel/magazine clamp (installed)
The Express Magnum configuration provides 20-gauge versatility with a chamber rated for 2 3/4" and 3" shells. The 21" barrel has a ventilated rib and a single front bead for straightforward sighting.
The installed Knoxx Industries SpecOps stock adds adjustability with a telescoping, pistol-grip design and rugged polymer construction. A polymer forend complements the setup for positive pump operation.
The magazine tube extension with barrel/mag clamp delivers a stated 6+1 capacity and adds secure support at the front end. The receiver is steel, finished in matte black, and marked "870 EXPRESS MAGNUM."
Operational features include dual action bars for robust cycling and a cross-bolt safety located behind the trigger. Built in the USA, this 870 Express Magnum presents a practical, upgraded configuration ready for 20-gauge use.




