Introduction
The Mossberg 500 shotgun stands as an icon in the world of firearms, celebrated for its robust design, versatility, and reliability. It’s a workhorse, trusted by law enforcement, military personnel, and civilian shooters alike. The pump-action system, a cornerstone of its appeal, makes it a versatile weapon capable of handling various ammunition types and excels in a variety of roles, from home defense to hunting.
A critical, yet often overlooked, component of the Mossberg 500’s functionality is the trigger assembly. This small but vital system is responsible for initiating the firing sequence – when you pull the trigger, the hammer is released to strike the firing pin, ultimately igniting the primer and sending the shot or slug downrange. Understanding the trigger assembly’s role is fundamental to appreciating the overall mechanism of the shotgun.
This article focuses on a common upgrade for the Mossberg 500: replacing the factory trigger assembly with a metal trigger assembly. This upgrade is particularly attractive for those seeking enhanced durability and a more refined trigger feel. The factory trigger assembly in many Mossberg 500 models uses polymer components. While these are functional, they are susceptible to wear and tear over time, especially with heavy use. Replacing them with a metal alternative offers increased longevity and, in many cases, a noticeably improved trigger pull.
The purpose of this guide is to provide you, the reader, with a comprehensive, step-by-step walkthrough of the **Mossberg 500 metal trigger assembly replacement** process. We will cover everything from gathering the necessary tools and materials to carefully removing the old trigger assembly, installing the new one, and ensuring proper function. Our aim is to empower you to undertake this upgrade with confidence, resulting in a more reliable and enjoyable shooting experience.
Reasons to Upgrade Your Mossberg 500 Trigger Assembly
Upgrading your Mossberg 500 trigger assembly offers several compelling advantages that contribute to a better shooting experience and extend the lifespan of your firearm. These benefits often outweigh the relatively straightforward effort required for the replacement.
One of the primary advantages is a significant increase in durability and overall reliability. Metal trigger assemblies are inherently stronger than their polymer counterparts. This robust construction resists wear and tear from repeated use, ensuring that your trigger mechanism functions consistently, shot after shot. This added durability is particularly beneficial for those who put their Mossberg 500 through extensive training, hunting, or competition shooting. The ability to withstand the rigors of frequent firing leads to a longer lifespan for the trigger system, saving money and time in the long run by reducing the need for future repairs or replacements.
Another substantial benefit is the potential for an improved trigger feel. Metal trigger assemblies are often engineered with tighter tolerances and smoother surfaces than their polymer counterparts. This can translate into a more refined trigger pull, characterized by a cleaner break and a more consistent feel. The shooter experiences less “creep” or hesitation as the trigger is pulled, leading to better shot placement and greater accuracy. A crisp, clean trigger pull instills confidence and helps to maximize your shooting potential. Even the slightest improvement in trigger feel can have a noticeable impact on your ability to consistently hit your target.
Beyond the functional improvements, upgrading to a metal trigger assembly can also offer resistance to environmental factors. Metal parts are generally less susceptible to damage from temperature fluctuations or exposure to solvents and cleaning chemicals, making them a more dependable option for use in a variety of conditions.
Essential Tools and Materials
Before embarking on your **Mossberg 500 metal trigger assembly replacement** project, gathering the correct tools and materials is crucial for a smooth and successful process. Having everything readily available will prevent frustrating interruptions and streamline the entire procedure.
First and foremost, you’ll need a selection of screwdrivers. These should include a variety of sizes and head types. A set with both flathead and Phillips head screwdrivers is advisable, as the Mossberg 500 features screws of different types and sizes. A small flathead screwdriver is particularly useful for driving out the roll pins that secure the trigger assembly to the receiver.
Next, you will require a quality punch set, specifically a roll pin punch set. This set will provide you with the necessary tools to safely and effectively remove the roll pins without causing damage to the receiver. A roll pin punch is designed with a specific tip that engages with the pin’s edges. A standard punch set may also be useful for smaller pins or detents.
A hammer is essential for using the punch set. Choose a hammer of appropriate size and weight to provide sufficient force to drive out the roll pins without being overly aggressive.
While optional, a gunsmithing vise or a vise with soft jaws is highly recommended. Securing the receiver in a vise will provide stability during the removal and installation of the trigger assembly. This enhances safety and makes the task easier.
Prepare a clean and well-lit work surface. A cluttered or dirty workspace can lead to lost parts or potential damage to your firearm.
For the materials, you’ll need the new metal trigger assembly. Ensure that the replacement is specifically designed for the Mossberg 500. Consider the brand and material. Aftermarket trigger assemblies are available from many reputable manufacturers. Research and select a trigger assembly that meets your specific needs and preferences, considering factors such as trigger pull weight and overall construction quality.
Gun oil or lubricant is also essential. Apply a small amount of oil to the new trigger assembly during installation, which will help ensure smooth function and reduce wear.
Finally, it is sometimes recommended to have new roll pins. When removing roll pins, there is a chance of damaging them. Having new ones on hand ensures that you have everything you need to complete the project.
Important Safety Precautions
Firearm safety is paramount. Before commencing any work on your Mossberg 500, prioritize safety above all else. Failure to adhere to these safety precautions could lead to serious injury or damage.
Firstly, confirm that the firearm is unloaded. Visually and physically check the chamber to ensure that it is empty of ammunition. Clear the chamber multiple times and inspect the magazine tube to ensure that it is completely unloaded.
Secondly, always point the muzzle of the firearm in a safe direction, preferably at a designated safety backstop. Never point the gun at anything you are not willing to destroy or injure.
Thirdly, understand and adhere to all local, state, and federal laws regarding firearm ownership, modification, and maintenance. Familiarize yourself with any regulations that apply to your area.
Fourth, a good understanding of basic gun safety principles is a must. These principles are:
- Treat every firearm as if it is loaded.
- Never point the muzzle at anything you are not willing to destroy.
- Keep your finger off the trigger until you are ready to shoot.
- Be sure of your target and what is beyond it.
If you are unfamiliar with any of these principles, seek guidance from a qualified firearms instructor or gunsmith before proceeding with the **Mossberg 500 metal trigger assembly replacement**.
Steps for Replacing the Trigger Assembly
This section provides a step-by-step guide for the **Mossberg 500 metal trigger assembly replacement**. Follow each step carefully to ensure a successful outcome.
Begin by disassembling the shotgun. With safety the highest priority, make absolutely sure the shotgun is unloaded before beginning. With that done, open the action of the shotgun by pumping the forend to the rear. This allows you to visually check the chamber, confirming it is empty. Remove the barrel by unscrewing it from the receiver. Detach the forend (pump slide) from the action bars. The forend usually slides off forward when the action is open. Then remove the bolt from the receiver by removing the bolt retaining screw and pulling it free.
Now it’s time to remove the old trigger assembly. Locate the roll pins that secure the trigger assembly to the receiver. These pins are usually visible on the side of the receiver, holding the trigger assembly in place. Place the receiver on a stable surface and support it firmly.
Using the appropriate size roll pin punch and your hammer, gently and carefully drive the roll pins out of the receiver. Position the punch on the edge of the roll pin and strike it with controlled taps of the hammer. Be careful not to deform the receiver. Work slowly and carefully, ensuring the punch is centered on the pin. If you are new to this, it can be very helpful to have a helper with the punch, or place the gun on a vise.
Sometimes, the pins can be stubborn. If a roll pin is proving difficult to remove, you can try applying penetrating oil to the pin and allowing it to soak in for a short time. This may help loosen the pin. Repeat the process with the punch and hammer.
Once the roll pins are removed, carefully remove the old trigger assembly from the receiver. You may need to gently wiggle or maneuver it to free it from the frame.
Now, it’s time to install the new trigger assembly. Carefully insert the new metal trigger assembly into the receiver, aligning it with the corresponding holes.
Next, insert the roll pins to secure the new assembly. Align the holes in the trigger assembly with the holes in the receiver. Insert the new roll pins into the holes.
Use the punch and hammer to drive the roll pins back into their original positions. Ensure the pins are flush with the surface of the receiver, or slightly recessed. Make sure the trigger and safety functions have been installed and work before proceeding with the rest of the project.
Now that the trigger assembly is complete, it is time to reassemble the firearm. Reinstall the bolt. Then, reattach the forend (pump slide) to the action bars. Finally, reinstall the barrel, tightening it securely to the receiver.
Function Check and Testing
After completing the **Mossberg 500 metal trigger assembly replacement**, it is essential to conduct thorough function checks and testing to verify that the new trigger assembly is operating correctly and safely.
First, perform a function check. With the firearm still unloaded, dry-fire the shotgun. Engage and disengage the safety mechanism to ensure it functions properly. Pull the trigger and listen for the click of the hammer falling. Check the trigger pull for smoothness and crispness.
If the function check is satisfactory, you can proceed to test firing the shotgun. Select a safe and controlled environment for testing, such as a shooting range. Start with a single shell to test the operation of the new trigger assembly. After firing the shell, inspect the spent casing for any signs of abnormal primer strikes. Check for any malfunctions such as failure to fire, failure to eject, or failure to feed.
Gradually increase the number of rounds fired to confirm the reliability of the trigger assembly. If the trigger functions properly with one shell, move on to loading and firing multiple rounds. Continue to monitor the function of the trigger and the overall operation of the firearm.
Troubleshooting
Sometimes, despite your best efforts, problems can arise. Here are a few potential issues and solutions:
If the trigger does not function after installation, the assembly may be improperly seated or the pins might not be aligned. Carefully remove the assembly and inspect the installation, ensuring that all components are properly aligned and seated. Check the roll pins to confirm that they are fully inserted.
If the trigger pull feels rough or sticky, lubrication is likely the solution. Add a light coat of gun oil to the relevant parts of the trigger assembly. Also check for any signs of friction.
If the safety mechanism is not engaging properly, there may be an issue with the safety bar or the safety detent. Disassemble the assembly and reassemble to verify each component.
If you encounter difficulty with the roll pins, be patient. If the pins are proving especially difficult to remove, consider using a penetrating oil and giving it time to soak in.
If you still run into issues, consult with a qualified gunsmith for professional assistance.
Maintenance and Care
After the **Mossberg 500 metal trigger assembly replacement**, proper maintenance is essential for maintaining its long-term reliability and performance. Regular care ensures that the new trigger assembly functions properly and extends the lifespan of the components.
Periodically clean and lubricate the trigger assembly. After firing your shotgun, clean the trigger assembly of any debris or fouling that may accumulate during use. Use a quality gun cleaning solvent and a small brush to clean the trigger assembly. Apply a light coat of gun oil to the moving parts.
Follow the same principles for general gun maintenance: clean and lubricate the firearm regularly, inspect for any signs of wear and tear, and store your shotgun safely in a secure location.
Conclusion
Replacing the factory trigger assembly with a metal trigger assembly is a worthwhile upgrade for your Mossberg 500 shotgun. This project, while requiring care and attention to detail, is well within the capabilities of many gun owners. By following the steps outlined in this guide, you can confidently complete the **Mossberg 500 metal trigger assembly replacement** and enjoy the benefits of improved durability and a more refined trigger feel. Remember to prioritize safety throughout the process, follow each step carefully, and double-check the functionality of the trigger assembly after installation.
