Understanding the Heart of the Action
What is the Action Slide Tube?
The Mossberg 500 shotgun is more than just a firearm; it’s an American icon. Its reputation for reliability, versatility, and affordability has made it a favorite among hunters, law enforcement, and home defenders for generations. A crucial component in the smooth, dependable operation of this legendary shotgun is the action slide tube. This guide aims to delve deep into the intricacies of the Mossberg 500 action slide tube, ensuring you have the knowledge needed to maintain, troubleshoot, and even upgrade this vital part of your shotgun.
At its core, the Mossberg 500 is a pump-action shotgun. This means the shooter manually cycles the action to chamber a new round, eject the spent shell, and ready the gun for the next shot. This entire operation is centered around the action slide tube, a key mechanism.
What exactly is the action slide tube? It’s the cylindrical component, typically constructed from metal, that houses and guides the moving parts of the pump-action system. You can usually locate it directly beneath the barrel. It’s what you grip with your non-dominant hand to work the action. This assembly is made up of several interconnected parts which all work together.
The Role of the Action Slide Tube
The critical function of the action slide tube is to enable the pump-action cycle. When you pull the forend (the part you grasp) rearward, the action bars attached to the slide tube retract the bolt from the barrel’s breech, which pulls the spent shell from the chamber and ejects it. As you then push the forend forward, the bolt strips a new round from the magazine, feeds it into the chamber, and locks the action, getting the shotgun ready to fire. The seamless operation of the action slide tube assembly dictates the speed at which you can load the shotgun and reload the shotgun in the field.
Importance of a Properly Functioning Action Slide Tube
The dependability of a shotgun often hinges on the action slide tube. A clean, well-maintained action slide tube ensures that the shotgun functions flawlessly. A malfunctioning action slide tube can lead to numerous issues, including failure to feed, failure to eject, or even complete jams. Imagine finding yourself in a critical situation, only to have your shotgun malfunction. Proper care of your action slide tube is a cornerstone of safe and reliable firearm ownership.
Deconstructing the Action Slide Tube Assembly
Components of the Action Slide Tube Assembly
Let’s take a closer look at the parts that comprise the action slide tube assembly. Understanding these components will help you diagnose and address any problems that might arise.
The action slide tube itself is typically a sturdy metal cylinder. The tube provides the structure around which the action works, and it’s engineered to withstand significant wear and tear, including the impacts that happen in a firing sequence.
Attached to the action slide tube is the all-important forend nut, or action slide tube nut. This nut secures the forend to the action slide tube. Over time, this nut can sometimes loosen due to vibration during firing, so be sure to check the nut on a regular basis.
The forend, also known as the slide handle, is the component you physically grip and move to cycle the action. Forends come in a variety of materials, including synthetic polymer and wood. The shape of the forend provides a secure grip and allows the user to easily cycle the action. The design of the forend can also affect the feel and balance of the shotgun.
Connecting the forend to the bolt, which directly engages the shell during feeding and ejection, are the action bars, also known as slide bars. These bars are critical to the entire action, and the movement of these bars directly dictates the function of the loading mechanism. The action bars, securely affixed to the action slide tube, translate the forend’s movement into the mechanical actions needed to operate the shotgun.
Variations and Differences
While the core mechanism of the Mossberg 500 remains consistent, you might encounter variations depending on the gauge (12, 20, and .410), barrel length, and specific model.
Older and newer models of the Mossberg 500 can occasionally have minor differences in the design of the action slide tube assembly, but the fundamental principle remains the same. However, it’s always a good idea to check the parts diagram and consult a gunsmith if you are unsure about compatibility.
Models and gauge differences are also common. For example, the action slide tube for a 12-gauge might be slightly different in length or design compared to a 20-gauge or .410 model, due to differences in the size of the shells. Barrel length can also influence the design. Longer barrels can result in longer forends or altered action bar designs to accommodate the larger shotgun.
Maintaining Your System
Cleaning the Action Slide Tube Assembly
The longevity and reliability of your Mossberg 500 are directly tied to proper maintenance of the action slide tube assembly. Regular cleaning and lubrication will ensure your shotgun continues to operate smoothly and dependably for years to come.
The cleaning process is straightforward but requires careful attention. Begin by disassembling the forend from the action slide tube. The best way to do this is to make sure the shotgun is unloaded. Consult your owner’s manual or online resources if you are not familiar with disassembling the forend.
You’ll need a few essential tools and materials: a quality gun cleaning solvent, a brush (bronze or nylon), cleaning patches, and gun oil or a dedicated lubricant.
Start by spraying the cleaning solvent onto the action slide tube assembly, specifically targeting areas where carbon build-up and grime are likely to accumulate. Use the brush to scrub away any debris, paying close attention to the inner surfaces of the action slide tube and the action bars.
Next, use patches to wipe away the solvent and any loosened debris. Continue using fresh patches until they come out clean.
Lubrication
After cleaning, the entire assembly needs to be lubricated. Apply a thin coat of high-quality gun oil or a lubricant specifically designed for firearms. Avoid using too much lubricant, as this can attract dirt and debris. The right amount of lubricant is just enough to provide a thin layer of protection. Reassemble the forend onto the action slide tube, making sure everything fits together correctly.
Troubleshooting Common Issues
Common Problems and Troubleshooting
Despite proper care, problems can sometimes occur. Here are some common issues and how to troubleshoot them.
A sticking or sluggish action is a common symptom that can be a result of a dirty or dry action slide tube. The cure for this is cleaning and lubrication. If cleaning and lubrication do not solve the issue, inspect the assembly for any damage.
Failure to feed or eject can also be caused by a problem with the action slide tube. This could be due to the shell or the action bars. Ensure the action bars are not bent or damaged. The action slide tube itself could be obstructed by debris, preventing smooth operation. Inspect the ejector and ensure it is functioning correctly.
Over time, components of the assembly can wear out. Look for signs of wear and tear on the action slide tube itself, the action bars, and the forend. If you identify worn or damaged parts, it’s crucial to replace them to maintain the safety and functionality of your shotgun.
By regularly inspecting your shotgun, you can identify and address potential problems before they escalate. Checking the components of your system before and after each trip to the range or hunting trip is a good practice.
Replacement and Upgrades
When to Replace the Action Slide Tube Assembly
If your action slide tube assembly becomes excessively worn or damaged, replacement is necessary. Fortunately, replacement parts are readily available.
Purchasing a Replacement
Where can you obtain a replacement? Gun stores, both brick-and-mortar and online retailers, are excellent sources. Be sure to purchase a high-quality replacement from a reputable manufacturer. Ensure the replacement is compatible with your specific Mossberg 500 model and gauge. Check online reviews to get an idea of the quality before you buy.
Upgrading the Forend
Are there upgrades available? Many Mossberg 500 owners opt to upgrade their forend. Aftermarket forends come in a variety of styles, including synthetic, wood, and pistol-grip versions. A new forend can improve the ergonomics, aesthetics, and overall feel of the shotgun.
The installation process for a new forend is typically straightforward. After removing the old forend, simply install the new one, following the manufacturer’s instructions. Take your time and carefully check everything to make sure you’re doing it correctly.
Safety Considerations
Safety First
Always prioritize safety when handling any firearm. Before undertaking any maintenance or upgrades to the Mossberg 500 action slide tube, confirm the shotgun is unloaded. Remove all ammunition from the area. Always point the muzzle in a safe direction.
Familiarize yourself with all safety procedures. Ensure you understand the proper handling procedures. Always store your shotgun in a secure location.
Conclusion
The Mossberg 500 action slide tube is an essential part of this classic shotgun. Understanding its function, maintaining it properly, and knowing how to address common problems are all essential for responsible firearm ownership. Regular cleaning, lubrication, and inspection will ensure your shotgun functions safely and reliably for years to come. Take the time to learn about this crucial part of your shotgun. It is a great investment for the safe and reliable use of your weapon. Remember, with proper care, your Mossberg 500 will be a trusted companion for years to come.
