Understanding the Forend Tube Assembly
What is the Forend Tube Assembly?
At its core, the 870 forend tube assembly is responsible for facilitating the pump-action mechanism. When you grasp the forend, the sliding handle, and move it backward and forward, you’re directly interacting with this assembly. It’s the link between your grip and the internal workings of the shotgun, driving the loading, firing, and ejection processes.
What exactly constitutes the 870 forend tube assembly? Let’s break it down.
First and foremost, there’s the tube itself, often called the forend tube. This is a cylindrical housing that runs along the underside of the barrel and receiver. Within this tube, critical parts of the action reside and move. The tube provides structural support and guides the reciprocating parts during cycling.
The action bars are essential components. These are typically two slender metal rods that connect the forend to the bolt. As you move the forend, the action bars transmit this motion to the bolt, controlling the extraction of spent shells, the loading of fresh cartridges, and the overall cycling of the weapon. They are the workhorses of the action, subject to considerable stress during operation.
The forend itself, or slide, is the part you directly grip and manipulate. It provides a secure and comfortable hold, allowing the user to smoothly cycle the action. The forend’s design can vary, offering different textures, materials, and aesthetic features, but its fundamental purpose remains the same: to provide a gripping surface for the shooter to operate the action.
Finally, the retaining nut, also known as the forend cap, secures the forend tube to the receiver. This is a crucial component that holds the entire assembly together, preventing the forend from detaching during use. The design and material of the retaining nut can influence the ease of disassembly and reassembly, as well as the overall aesthetics of the shotgun.
Key Functions of the Assembly
The functions this assembly handles are critical to smooth operation.
One key job is cycling the action. This involves a series of sequential actions: extracting the spent shell casing from the chamber, ejecting it from the shotgun, feeding a fresh round from the magazine tube into the chamber, and finally, locking the bolt. The forend tube assembly provides the mechanical linkage that makes all of this possible.
Additionally, the 870 forend tube assembly offers the shooter a means of gripping the firearm. The forend provides an ergonomic and secure point of contact, allowing the user to control the shotgun and maintain a stable shooting platform.
And, of course, it provides a measure of protection. The forend tube and its related components shield many of the internal action parts from external elements and accidental damage.
Components in Depth
The Forend Tube
The forend tube, the cylindrical heart of the 870 forend tube assembly, is typically crafted from steel. Steel offers a balance of strength, durability, and resistance to wear. The tube’s length often correlates with the magazine capacity of the shotgun; shorter tubes will often be found on models with shorter magazine tubes, while extended magazine tubes frequently necessitate longer forend tubes. It is also important to consider its fit with specific Remington 870 models, like the Police model or the Wingmaster. Make sure the tube you buy is compatible with your specific variant of the shotgun.
Action Bars
The action bars are critical for smooth and reliable cycling. These are typically made from hardened steel to withstand the high stresses imposed during operation. Over time, these bars can become worn, bent, or damaged, particularly if the shotgun is used frequently or improperly maintained. It’s essential to regularly inspect them for any signs of wear, such as scoring, deformation, or corrosion. These imperfections can lead to malfunctions. They attach to the bolt at the rear of the action and to the forend at the front, working in unison to translate the user’s movement into the action’s internal processes.
The Forend (Slide)
The forend is, of course, the part that the user grips and manipulates. Most factory 870 shotguns come with forends made from wood or polymer. Wood offers a classic aesthetic and can be further customized. Polymer forends are known for their durability, resistance to the elements, and affordability. The forend’s design varies significantly. Some models feature finger grooves and textured surfaces for a secure grip, while others are smooth and streamlined. Aftermarket forends offer many possibilities, from tactical models with Picatinny rails and integrated accessories to ergonomic designs that prioritize comfort and ease of use.
Retaining Nut/Cap
The retaining nut secures the 870 forend tube assembly to the receiver, preventing it from detaching during use. The design and construction of the retaining nut vary. Factory retaining nuts are generally functional and reliable. Aftermarket versions are often available, manufactured from different materials and sometimes offering enhanced features. Properly tightening the retaining nut is essential. It must be snug enough to prevent the forend tube from loosening during use, but not so tight as to strip the threads.
Installation and Maintenance
Installing the Forend Tube Assembly
Proper installation and maintenance are crucial for maximizing the performance and longevity of your 870 forend tube assembly.
Installing the assembly requires a few essential tools: a screwdriver (typically flathead) to remove the magazine cap, and possibly a vise. First, unload the shotgun and ensure it is safe to handle. Remove the magazine cap, often located at the end of the magazine tube. Then, remove the barrel. Carefully slide the old forend off the magazine tube. Next, slide the new forend tube assembly onto the magazine tube, making sure that the action bars align correctly with the bolt. Reinstall the barrel. Finally, tighten the retaining nut until it is snug, but not overtightened.
Maintenance and Cleaning
Regular maintenance of the 870 forend tube assembly is essential. After each use, clean the assembly, removing any dirt, debris, or unburnt powder. Use a high-quality gun cleaning solvent and a brush or cloth to remove any buildup. Lubricate the moving parts with a light coat of gun oil. Proper lubrication reduces friction and wear, ensuring smooth and reliable operation. Check the action bars and forend tube for any signs of wear, such as scoring, dents, or corrosion. If any components are damaged, replace them promptly.
Aftermarket Options and Upgrades
Exploring Aftermarket Options
The aftermarket world offers an array of options to customize and upgrade your 870 forend tube assembly.
Extended magazine tube compatibility is a frequent consideration. Many shooters choose to increase the magazine capacity of their 870, which often requires a forend tube compatible with an extended magazine tube. Ensure the forend tube matches the length of the magazine tube to maintain functionality.
Tactical forends have features tailored to the modern shooter. These forends often incorporate Picatinny rails for mounting accessories like lights, lasers, and vertical grips.
Ergonomic forends prioritize comfort and control. These may feature custom grips, enhanced textures, or modified shapes to improve the shooter’s grip and control.
Different materials, like aluminum or carbon fiber, are also used in aftermarket forends. These materials offer benefits in terms of weight reduction, increased strength, or enhanced aesthetics.
Advantages and Disadvantages
Carefully weigh the pros and cons before upgrading the 870 forend tube assembly. Ensure the selected upgrades align with your shooting needs and preferences. Look for trusted brands and manufacturers known for quality and reliability.
Troubleshooting Common Issues
Forend Sticking or Binding
Even with proper maintenance, you may encounter issues with your 870 forend tube assembly.
If the forend sticks or binds, there could be several causes. Debris, such as dirt, sand, or unburnt powder, might be hindering smooth operation. Improper lubrication can also cause binding. Inspect the assembly, clean it thoroughly, and lubricate it properly. Damaged action bars can also contribute to sticking.
Difficulty Pumping the Action
Difficulty pumping the action is another common problem. Bent or damaged action bars can make it difficult to cycle the action. Tight tolerances or burrs within the mechanism could also contribute to the problem. Inspect the action bars for damage and ensure all components are properly lubricated. Check for any obstructions.
Loose Forend
A loose forend can be caused by a worn or loose retaining nut. Tighten the nut and ensure that it is holding the assembly securely. Worn threads on the nut or the magazine tube can also cause the forend to loosen. In these cases, you may need to replace the retaining nut or, in extreme cases, the magazine tube.
Failure to Cycle Properly
Failure to cycle properly can be related to the 870 forend tube assembly. If the action doesn’t cycle smoothly, check for any of the issues mentioned above. Carefully inspect the action bars for damage. Check the chamber for any obstructions and that the bolt is properly engaging. Ensure the magazine spring is functioning correctly and that you are using the correct ammunition.
Safety Considerations
Prioritize safe gun handling practices at all times. Always treat every firearm as if it were loaded. Never point the shotgun at anything you are not willing to destroy. Keep your finger off the trigger until you are ready to fire. Be sure of your target and what is beyond it. Store your firearms securely, unloaded, and separate from ammunition. Seek professional assistance from a gunsmith if you encounter any issues you cannot resolve yourself.
Conclusion
The 870 forend tube assembly is a critical component of a beloved and reliable firearm. By understanding its components, functions, and maintenance requirements, you can ensure your 870 continues to perform flawlessly for many years to come. Regular cleaning, proper lubrication, and careful inspection are crucial for preventing malfunctions and ensuring safety. The aftermarket offers a range of possibilities for customization and upgrades. Remember that safety should always be your top priority.
Consider these insights for your own firearm care. Ensure your shotgun functions at its best.
