Introduction to Threading the FN 509 Barrel

If you’re an FN 509 enthusiast, you might be considering modifying your firearm to enhance its performance and customization options. One popular modification is threading the barrel, which allows you to attach various accessories such as suppressors or muzzle brakes. Threading your FN 509 barrel can significantly improve your shooting experience and add a personal touch to your firearm. In this ultimate guide, we will explore seven effective ways to thread your FN 509 barrel, providing you with the knowledge and steps needed to achieve a successful outcome.

Method 1: Professional Gunsmith

The most recommended and safest approach to threading your FN 509 barrel is by seeking the expertise of a professional gunsmith. Gunsmiths are highly skilled individuals with extensive knowledge and experience in firearm modifications. They possess the necessary tools and equipment to perform the threading process accurately and safely. Here’s a step-by-step guide on how to proceed with this method:

Step 1: Research and Find a Reputable Gunsmith

Begin by researching and finding a reputable gunsmith in your area who specializes in firearm modifications. Look for reviews, recommendations, and their expertise in threading barrels. Ensure they have experience working with FN firearms specifically.

Step 2: Contact and Schedule an Appointment

Once you’ve identified a suitable gunsmith, contact them to schedule an appointment. Provide them with the details of your FN 509 and discuss your threading requirements. Be clear about the thread pitch and diameter you desire for your barrel.

Step 3: Drop Off Your FN 509

On the scheduled day, drop off your FN 509 at the gunsmith’s workshop. Ensure that you have the necessary paperwork and authorization to allow the gunsmith to perform the modification. Provide them with any specific instructions or preferences you may have.

Step 4: Pick Up and Inspect

After the gunsmith has completed the threading process, arrange a time to pick up your modified FN 509. Inspect the firearm carefully, ensuring that the threading is clean, accurate, and meets your expectations. Ask the gunsmith any questions you may have regarding the modification and its functionality.

Method 2: DIY Threading with a Lathe

If you have access to a lathe and possess the necessary skills, you can attempt to thread your FN 509 barrel yourself. However, it is important to note that this method requires precision and expertise to avoid damaging your firearm. Here’s a guide on how to proceed with DIY threading:

Step 1: Gather the Necessary Tools and Equipment

Before starting the threading process, ensure you have the following tools and equipment:

• Lathe machine
• Thread cutting tools (taps and dies)
• Center drill
• Chuck and collet
• Measuring tools (calipers, micrometers)
• Safety equipment (eye protection, gloves)

Step 2: Prepare the Barrel

Clean and inspect your FN 509 barrel to ensure it is free from any debris or damage. Secure the barrel in the lathe’s chuck or collet, ensuring a stable and precise setup.

Step 3: Determine Thread Specifications

Research and determine the appropriate thread specifications for your FN 509 barrel. This includes the thread pitch, diameter, and length. Consult the manufacturer’s guidelines or seek advice from experienced firearms enthusiasts.

Step 4: Cut the Threads

Using the lathe and thread cutting tools, carefully cut the threads onto the barrel. Follow the specified thread pitch and diameter, ensuring accuracy and consistency. Take your time and make gradual cuts to avoid any mistakes.

Step 5: Inspect and Finish

Once the threads are cut, carefully inspect the barrel for any imperfections or inconsistencies. Use a thread gauge to verify the accuracy of the threads. If necessary, make any adjustments or refinements to ensure a perfect fit for your desired accessories.

Method 3: Barrel Threading Kits

Barrel threading kits provide a convenient and cost-effective solution for threading your FN 509 barrel. These kits typically include all the necessary tools and instructions to complete the threading process. Here’s a step-by-step guide on how to use a barrel threading kit:

Step 1: Purchase a Suitable Kit

Research and purchase a barrel threading kit specifically designed for the FN 509. Ensure the kit includes the correct thread pitch and diameter for your barrel.

Step 2: Follow the Instructions

Carefully read and follow the instructions provided with the threading kit. These instructions will guide you through the entire process, ensuring a successful outcome.

Step 3: Prepare the Barrel

Clean and inspect your FN 509 barrel, just as you would for the previous methods. Ensure the barrel is free from any obstructions or damage.

Step 4: Attach the Threading Tool

Attach the threading tool provided in the kit to your FN 509 barrel. Follow the instructions to ensure a secure and precise fit.

Step 5: Cut the Threads

Using the threading tool, carefully cut the threads onto the barrel. Follow the specified thread pitch and diameter, taking your time to avoid any errors.

Step 6: Inspect and Finish

Once the threads are cut, inspect the barrel for any imperfections. Use the provided thread gauge to verify the accuracy of the threads. Make any necessary adjustments or refinements to ensure a perfect fit.

Method 4: Custom Threading Services

If you prefer a more personalized approach, you can opt for custom threading services offered by specialized firearm modification companies. These companies provide customized threading solutions based on your specific requirements. Here’s how to proceed with this method:

Step 1: Research and Find a Reliable Company

Research and identify reputable companies that offer custom threading services for firearms. Look for reviews, testimonials, and their expertise in working with FN firearms.

Step 2: Contact and Discuss Your Requirements

Contact the chosen company and discuss your threading requirements. Provide them with the details of your FN 509, including the desired thread pitch, diameter, and any specific preferences.

Step 3: Send Your Barrel for Threading

After discussing the details, send your FN 509 barrel to the company for threading. Ensure you follow their instructions and provide any necessary paperwork or authorization.

Step 4: Receive and Inspect

Once the company has completed the custom threading, they will send your modified barrel back to you. Inspect the barrel carefully, ensuring the threading meets your expectations and specifications.

Method 5: Threading with a Rotary Tool

For those with access to a rotary tool, such as a Dremel, you can attempt to thread your FN 509 barrel using this method. While it requires precision and skill, it can be a cost-effective option. Here’s a guide on how to proceed:

Step 1: Gather the Necessary Tools

Ensure you have the following tools and accessories for this method:

• Rotary tool (Dremel or similar)
• Thread cutting attachments (taps and dies)
• Center drill
• Safety equipment (eye protection, gloves)

Step 2: Prepare the Barrel

Clean and inspect your FN 509 barrel, ensuring it is free from any debris. Secure the barrel in a stable setup, such as a vise or a custom-made fixture.

Step 3: Determine Thread Specifications

Research and determine the appropriate thread specifications for your FN 509 barrel. This includes the thread pitch, diameter, and length.

Step 4: Cut the Threads

Using the rotary tool and thread cutting attachments, carefully cut the threads onto the barrel. Follow the specified thread pitch and diameter, taking your time to achieve accurate results.

Step 5: Inspect and Finish

Once the threads are cut, inspect the barrel for any imperfections. Use a thread gauge to verify the accuracy of the threads. Make any necessary adjustments to ensure a proper fit for your desired accessories.

Method 6: Milling Machine Threading

If you have access to a milling machine, you can consider using it to thread your FN 509 barrel. Milling machines offer precision and control, making them a suitable option for this modification. Here’s a guide on how to proceed:

Step 1: Gather the Necessary Tools and Equipment

Ensure you have the following tools and equipment for this method:

• Milling machine
• Thread cutting tools (taps and dies)
• End mill
• Measuring tools (calipers, micrometers)
• Safety equipment (eye protection, gloves)

Step 2: Prepare the Barrel

Clean and inspect your FN 509 barrel, ensuring it is free from any damage or debris. Secure the barrel in the milling machine’s vice or clamp, ensuring a stable and precise setup.

Step 3: Determine Thread Specifications

Research and determine the appropriate thread specifications for your FN 509 barrel. This includes the thread pitch, diameter, and length.

Step 4: Cut the Threads

Using the milling machine and thread cutting tools, carefully cut the threads onto the barrel. Follow the specified thread pitch and diameter, taking your time to achieve accurate results.

Step 5: Inspect and Finish

Once the threads are cut, inspect the barrel for any imperfections. Use a thread gauge to verify the accuracy of the threads. Make any necessary adjustments or refinements to ensure a perfect fit.

Method 7: Threading with a Drill Press

A drill press can also be used to thread your FN 509 barrel, providing a cost-effective and accessible option. Here’s a step-by-step guide on how to proceed:

Step 1: Gather the Necessary Tools

Ensure you have the following tools for this method:

• Drill press
• Thread cutting attachments (taps and dies)
• Center drill
• Safety equipment (eye protection, gloves)

Step 2: Prepare the Barrel

Clean and inspect your FN 509 barrel, ensuring it is free from any obstructions. Secure the barrel in a stable setup, such as a custom-made fixture or a vise.

Step 3: Determine Thread Specifications

Research and determine the appropriate thread specifications for your FN 509 barrel. This includes the thread pitch, diameter, and length.

Step 4: Cut the Threads

Using the drill press and thread cutting attachments, carefully cut the threads onto the barrel. Follow the specified thread pitch and diameter, taking your time to avoid any mistakes.

Step 5: Inspect and Finish

Once the threads are cut, inspect the barrel for any imperfections. Use a thread gauge to verify the accuracy of the threads. Make any necessary adjustments or refinements to ensure a proper fit for your desired accessories.

Conclusion

Threading your FN 509 barrel offers a range of benefits, from improved performance to enhanced customization options. By following the methods outlined in this guide, you can achieve a successful and accurate threading process. Whether you choose to work with a professional gunsmith, utilize a threading kit, or attempt a DIY approach, ensure you prioritize safety and precision throughout the modification process. With the right tools, knowledge, and attention to detail, you can transform your FN 509 into a personalized and highly functional firearm.

💡 Note: Remember to consult local laws and regulations regarding firearm modifications. Ensure you have the necessary permits and authorization before proceeding with any modifications.