The forend tube assembly, specific to older 12-gauge Remington 870 shotguns, is a crucial component connecting the forend (or pump) to the action. It houses the action bars, which cycle the shotgun’s mechanism, and provides a stable platform for the user to operate the pump action. This specific design predates later models and is often sought by enthusiasts and collectors.
The older-style assembly often features a longer tube and different attachment methods compared to contemporary versions. This distinction is important for parts compatibility and restoration projects. Maintaining the correct assembly ensures proper function and retains the historical accuracy of vintage 870s. Its robust design contributed to the 870s reputation for reliability, making these older models popular among hunters and sport shooters.