If you are looking for a comprehensive guide on how to remove the frame control unit (FCU) from your SIG P320, this guide is for you. This guide will provide step-by-step instructions on how to safely and properly remove the FCU, as well as tips and tricks on how to make this process easier and more efficient. By following this guide, you will be able to remove the FCU from your SIG P320 quickly and easily.
Step-By-Step Guide to Remove the FCU on Your SIG P320
Step 1: Disassembly
Before attempting to remove the FCU, make sure the SIG P320 is unloaded and clear. Start by removing the magazine, locking the slide back and verifying that the chamber is empty. Then, pull down on the takedown lever located on the left side of the gun and slide the slide off the frame.
Step 2: Remove the FCU
Once the slide is off the frame, you can access the FCU. Locate the two pins on either side of the frame, and use a punch or small screwdriver to push them out. Once the pins are removed, the FCU should be loose enough to pull out.
Step 3: Install the New FCU
To install the new FCU, first insert the new FCU into the frame, ensuring that the trigger bar is in the proper position. Then, reinstall the two pins and make sure they are secure.
Step 4: Reassembly
Once the new FCU is installed, you can begin to reassemble the SIG P320. Start by sliding the slide onto the frame and pushing down on the takedown lever. Then, insert the magazine and pull the slide back to ensure that the gun is properly reassembled.
Step 5: Test Fire
To make sure the new FCU is working properly, it is important to test fire the gun. Load a few rounds into the magazine and fire a few rounds at a target. If the gun functions properly, then the FCU installation is complete.
Need to Know Before Removing the FCU on Your SIG P320
Before attempting to remove the Fire Control Unit (FCU) on your SIG P320, you should be aware of a few important considerations. Firstly, you should understand that the FCU is the gun’s serialized part and is legally considered the firearm itself. As such, it is important to be aware of any applicable laws and regulations in your jurisdiction regarding the transfer of firearms. Additionally, the FCU should only be removed by a qualified gunsmith or armorer in a secure environment. This is important as the P320 requires specialized tools and knowledge for proper reassembly.

The FCU should also not be removed unless all ammunition has been removed from the firearm and the chamber cleared. Additionally, the magazine must be removed and the slide locked to the rear before attempting removal. Finally, after the FCU has been removed, it is important to ensure that it is stored in a safe and secure location.
Common Mistakes to Avoid During the Removal Process of the FCU on Your SIG P320
- Not having the right tools: The SIG P320 is a complex firearm that requires specialized tools for proper disassembly. Make sure to have the proper set of tools on hand before starting the removal process so that you don’t run into any problems along the way.
- Not following the instructions carefully: It is important to read through the instructions carefully before attempting to remove the FCU from your SIG P320. Failure to do so can result in damage to the firearm or even injury.
- Not keeping track of the parts: As you disassemble the SIG P320, make sure to keep track of the parts so that you can reassemble it correctly afterwards. Not doing so could result in improper reassembly, or worse, parts missing or damaged.
- Not cleaning and lubricating the parts: As you are disassembling and reassembling the SIG P320, make sure to clean and lubricate the parts. Not doing so could cause the gun to not function properly.
- Not properly stowing the FCU: Once the FCU has been removed from the SIG P320, make sure to store it in a safe place. Not doing so could result in it being misplaced or
Properly Maintain Your SIG P320 After Removing the FCU
In order to properly maintain your SIG P320 after removing the FCU (Fire Control Unit), there are a few steps you should take. First, make sure you are wearing the appropriate safety equipment, such as eye protection and ear protection. Next, disassemble the gun completely, cleaning and oiling all parts, including the slide, barrel, and frame. Once the components have been cleaned and oiled, you should inspect the parts for any damage or wear. If there are any issues, such as cracks, chips, or worn parts, they should be replaced immediately.
Next, reassemble the gun, making sure all pieces fit together properly and securely. Once the gun is fully assembled, it is important to test the gun by firing at least one round to ensure that it is functioning properly. Finally, you should store the gun in a safe place, away from children and other unauthorized persons.
By taking the time to properly maintain your SIG P320 after removing the FCU, you will ensure that the gun is in top condition for years to come.
Tips and Tricks to Make the Removal Process Easier for the FCU on Your SIG P320
If you’re planning to remove the fire control unit (FCU) from your SIG P320, there are a few tips and tricks that can make the process easier. Here are some of the best:
- Start by cleaning the firearm and ensuring that all components are in good working order. This will make it easier to take apart the firearm and also reduce the risk of damaging any of the parts.
- Use the correct tool for the job. There are specific tools designed for removing and installing the FCU, so make sure you’re using the right one.
- Make sure you have a good grip on the FCU when removing it. This will ensure that you don’t drop it and damage it.
- When reinstalling the FCU, be sure to line up all of the holes in the FCU with the holes in the frame of the gun. This will ensure that everything is properly aligned.
- Make sure the FCU is properly seated in the frame of the gun. This will ensure that everything will function properly and you won’t have any issues with the firearm.
By following these tips and tricks, the removal process for the FCU on your SIG P320 should be much easier. Good luck and happy shooting!
Troubleshooting Common Issues When Removing the FCU on Your SIG P320
The first step is to ensure that the firearm is not loaded and the magazine is removed. After that, the slide should be locked back to the rear. To do this, press the slide lock lever upwards and hold it in place. Once the slide is in the locked open position, you will need to depress the takedown lever. This is a small lever located on the left side of the pistol. Depressing the takedown lever will allow you to separate the slide from the frame.
If the slide still does not separate, you may need to take a look at the slide lock lever. Ensure that the slide lock lever is not in the down position. If so, it should be moved to the upward position. Additionally, you may need to check the lugs on the slide lock lever. These are small protrusions located on the lever that need to be aligned properly with the slide. If they are not aligned correctly, the slide will not separate from the frame.
Once the slide is separated, you should be able to remove the FCU. Make sure that the takedown lever is in the up position and the slide lock is in the down position. Then, depress the trigger and push the FCU out of the frame.
Frequently Asked Questions[FAQs]
What is a FCU?
FCU stands for Fire Control Unit and is the internal mechanical assembly in a Sig Sauer P320 pistol. It includes the trigger, trigger bar, sear, hammer, disconnector, and other components that work together to fire the pistol. The FCU is a critical component of the P320 and must be removed properly in order to disassemble the pistol.
What tools do I need to remove the FCU from a Sig P320?
To remove the FCU from a Sig P320, you will need a 3/32 Allen wrench, a Torx T10 bit, and a punch or other similar tool.
How do I remove the FCU from a Sig P320?
To remove the FCU from a Sig P320, first ensure the pistol is unloaded and the slide is removed from the frame. Then use a 3/32 Allen wrench to remove the two screws located on the frame that secure the FCU in place. After the screws are removed, use a Torx T10 bit to loosen the trigger pin located in the frame above the FCU. Once the pin is loose, use a punch or other similar tool to push out the pin from the frame. The FCU can then be removed from the frame.
What is the proper way to reinstall the FCU on a Sig P320?
To reinstall the FCU on a Sig P320, first insert the FCU into the frame, ensuring that the trigger bar is properly aligned with the trigger pin hole. Then use a punch or other similar tool to press the trigger pin into place. Finally, use the 3/32 Allen wrench to tighten the two screws located on the frame that secure the FCU in place.
What should I do if the trigger pin does not fit into the frame?
If the trigger pin does not fit into the frame, it is likely that the trigger pin hole is blocked by debris. In this case, use a punch or other similar tool to carefully clean the trigger pin hole before attempting to reinstall the trigger pin.
Are there any special considerations when removing and reinstalling the FCU on a Sig P320?
When removing and reinstalling the FCU on a Sig P320, it is important to ensure that the trigger pin is properly aligned with the trigger pin hole. It is also important to ensure that the FCU is properly seated in the frame and that the two screws located on the frame that secure the FCU in place are securely tightened.
What should I do if I encounter any difficulty when removing or reinstalling the FCU on a Sig P320?
If you encounter any difficulty when removing or reinstalling the FCU on a Sig P320, it is best to consult an experienced gunsmith or contact Sig Sauer customer service for assistance.
Conclusion
The SIG P320 is a great firearm, but it can be difficult to remove the FCU from it. However, with the right tools and knowledge, you can easily remove the FCU from your SIG P320. It is important to follow all safety protocols when working with firearms and to use the correct tools for the job. With the right tools and instructions, you can easily remove the FCU from your SIG P320.

A. Wilcox Head is a lifelong shooter, hunter, and firearms enthusiast. Head grew up in a family where firearms were a way of life, and from an early age, he was taught the importance of firearm safety, accuracy, and proper hunting techniques.