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Help! P320 safety spring loose

This is a discussion on Help! P320 safety spring loose within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; Hello everyone, I broke down my P320 for a much needed cleaning tonight and I'm pretty sure I popped the safety spring loose for the ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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Old 01-08-2017, 04:47 PM   #1
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Help! P320 safety spring loose

Hello everyone,

I broke down my P320 for a much needed cleaning tonight and I'm pretty sure I popped the safety spring loose for the SECOND time. All I did was pop the firing assembly out of the grip and brush it with a toothbrush to knock all the carbon off. Last time I had this problem I was cleaning with a copper brush and spent hours trying to put it back together before I decided to send it back to Sig. That time I must have messed up the trigger group trying to fix it, the trigger wouldn't give me the click when I pulled it. This time the trigger seems to work fine, I dry fired it, kept the trigger depressed, racked it, felt the reset, pulled trigger again and clicked like it's supposed to. But the safety spring looks like it's bouncing around in there and the safety lever moves freely up and down, I can't remember if this is normal. I really need to figure out how to do this myself as it's bound to happen again from normal cleaning. I'm also trying to avoid going without my EDC firearm for two weeks from sending it to Sig again. I tried looking for a list of SIG armorer's but haven't found any in the Columbia SC area. Any advice would be greatly appreciated. Thank you for reading!
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Old 01-08-2017, 05:06 PM   #2
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Last edited by LaGrange; 01-08-2017 at 05:19 PM. Reason: Accidentally posted same thing twice
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Old 01-08-2017, 05:16 PM   #3
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Originally Posted by LaGrange View Post


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Those are pictures of the assembly upside-down where you can clearly see the spring. the other shots are of the safety bar up and then down, I can move it freely with my finger. The bar does move up when I pull the trigger but does not spring return back down. It is supposed to spring return down, right?

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Old 01-08-2017, 05:33 PM   #4
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Something definitely appears to be wrong. I'm pretty new to the platform and I'd have to pop mine apart to verify this but I want to say the bottom leg of the spring contacts the lever and the top leg of the spring rests against the pin for the sear.

If you slide the larger pin out the left side just far enough to make space between the housing and the lever the spring pretty much almost just slips in. Might have to poke something through from the right side to get it lined up enough for the pin to go through but it should be easy.

Oh, and YouTube is your friend.

Good luck.
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Old 01-08-2017, 06:07 PM   #5
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Yes, just playing with mine. Springs back down
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Old 01-08-2017, 10:00 PM   #6
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Heeeeeere's Alma!

Alma is a member here who has a couple of videos that might help you. This first one is on disassembly of the lower part of the P320 FCU...
https://youtu.be/-JMcyq4xx60

And followed by a video on how to reassemble it...
https://youtu.be/IZtqJrwYCnc

I know it's a little intimidating, but watching Alma's videos helped me in installing my own Apex trigger. Specifically, it was his video on a better way to install the trigger return spring that got me "over the hump" with my installation.

I hope this is helpful.

Good luck!
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Old 01-09-2017, 03:38 AM   #7
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Thanks for getting back to me so quickly everyone!!! I'm stuck at work all day, haven't had a chance to watch the videos yet but I'm sure they'll help a lot. Are there any specific tools I might need, like a "punch" to get the pin out or can I just use a jeweler's screwdriver?

I am a "novice" gun owner, I just finished 10 years of active duty last February and finally settled somewhere with reasonable gun laws. This P320 is the first handgun I've owned. I clean it about every other time I hit the range. Am I doing something wrong here?? Is it normal to be able to disable the gun with a soft bristle toothbrush?? How do you guys go about cleaning the inside of your firing assembly without running into the same problem I am? Thanks again!

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Old 01-09-2017, 03:56 AM   #8
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Originally Posted by LaGrange View Post
Thanks for getting back to me so quickly everyone!!! I'm stuck at work all day, haven't had a chance to watch the videos yet but I'm sure they'll help a lot. Are there any specific tools I might need, like a "punch" to get the pin out or can I just use a jeweler's screwdriver?

I am a "novice" gun owner, I just finished 10 years of active duty last February and finally settled somewhere with reasonable gun laws. This P320 is the first handgun I've owned. I clean it about every other time I hit the range. Am I doing something wrong here?? Is it normal to be able to disable the gun with a soft bristle toothbrush?? How do you guys go about cleaning the inside of your firing assembly without running into the same problem I am? Thanks again!

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In my experience, you need 2 things to disassemble the FCU. A pair of needle nose pliers and a small pointy hard object (I use a small finish nail or picture hanging nail). You can push out all the pins using the nail and I also use it to help center the spring in question in the hole once the pin has been started thru the assembly.
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Old 01-09-2017, 03:52 PM   #9
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I ordered the Apex trigger for my P320F 9mm. I decided while I was in there I wanted to polish some things. I watched Alma's video once and tore it down....COMPLETELY. Then I did the polish work. Then I watched Alma's assembly video while assembling the FCU, pausing when I needed time. It made it easy to do. After that I was inspired and tore down my 2009 M&P Pro to see if they put the upgraded sear block in when I sent it in for work and then tore my Sigma SW40F down for spring removal to lower pull. The Youtube videos are helpful. I went from never tearing down a pistol action before to doing 3 in one day. Disclaimer due: I am an avid AR-15 "Smith" and have built and repaired many so I am a little more comfortable in there, just usually fewer and much bigger parts...lol!

Good Luck! You can do it!!

PS, I also had needle nose pliers, punch set and dental picks to help hold and place the small stuff.

Last edited by KillerMedic; 01-09-2017 at 03:53 PM. Reason: added PS
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