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FCU Spring replacement schedule

This is a discussion on FCU Spring replacement schedule within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; I just watched a couple of videos on disassembling/reassembling a P320 FCU. What a fiddly operation compared to tearing down a Glock One thing that ...


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

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Old 01-07-2017, 03:16 PM   #1
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FCU Spring replacement schedule

I just watched a couple of videos on disassembling/reassembling a P320 FCU. What a fiddly operation compared to tearing down a Glock

One thing that I did notice is that there are a big bunch of very delicate looking springs in there. Do they have to be replaced periodically, or are they considered good for the life of the pistol. Also, should the FCU be detail stripped for cleaning periodically, and if so, how after how many rounds?
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Old 01-07-2017, 03:27 PM   #2
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Armored service is recommended at 5000 and 10000 rounds
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Old 01-07-2017, 11:07 PM   #3
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Oh it ain't so fiddly

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Originally Posted by BBMW View Post
I just watched a couple of videos on disassembling/reassembling a P320 FCU. What a fiddly operation compared to tearing down a Glock
What I found pleasantly surprising was that I could do the entire disassembly and transfer of the FCU without tools and without having to pull the trigger.

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Originally Posted by BBMW View Post
One thing that I did notice is that there are a big bunch of very delicate looking springs in there. Do they have to be replaced periodically, or are they considered good for the life of the pistol. Also, should the FCU be detail stripped for cleaning periodically, and if so, how after how many rounds?
They do look delicate, but when I uninstalled the factory trigger and installed an Apex trigger on mine, those were some surprisingly robust mechanisms... able to withstand my clumsy handling and swearing at it.

There's a great sticky post at the top of this forum outlining the maintenance schedule called Factory Maintenance and Lubrication Specs for P320 pistols but I think it's pretty much covered by the warranty, for the most part. As far as stripping and cleaning the FCU, I'll defer to wiser more experienced users here. My experience is too new and so is my pistol to warrant such attention.
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Old 01-08-2017, 04:02 AM   #4
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Originally Posted by BBMW View Post
I just watched a couple of videos on disassembling/reassembling a P320 FCU. What a fiddly operation compared to tearing down a Glock

One thing that I did notice is that there are a big bunch of very delicate looking springs in there. Do they have to be replaced periodically, or are they considered good for the life of the pistol. Also, should the FCU be detail stripped for cleaning periodically, and if so, how after how many rounds?
I just got my first Glock and have plenty of experience ripping these FCUs apart. I'm interested in seeking the differences.

I didn't find the FCU cumbersome at all. In fact, I was quite pleased with it compared to my VP9. It all comes apart down to essentially nuts and bolts with a pair of pliers. I am pretty mechanically inclined so if you're "all thumbs" it can surely be frustrating.

As far as spring life, I can't imagine anything other than the trigger return spring is supposed to be serviced at any regular interval.
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Old 01-09-2017, 09:01 AM   #5
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Changing the trigger is actually a pretty easy, straightforward process. It's basically all on the outside of the FCU, and doesn't require a teardown. Getting to the internal springs is not quite so easy or straightforward.

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Originally Posted by HoosierDaddy View Post
What I found pleasantly surprising was that I could do the entire disassembly and transfer of the FCU without tools and without having to pull the trigger.


They do look delicate, but when I uninstalled the factory trigger and installed an Apex trigger on mine, those were some surprisingly robust mechanisms... able to withstand my clumsy handling and swearing at it.

There's a great sticky post at the top of this forum outlining the maintenance schedule called Factory Maintenance and Lubrication Specs for P320 pistols but I think it's pretty much covered by the warranty, for the most part. As far as stripping and cleaning the FCU, I'll defer to wiser more experienced users here. My experience is too new and so is my pistol to warrant such attention.
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Old 01-09-2017, 09:03 AM   #6
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One of the advantages of the Glock is that it has a smaller number of bigger, simpler, parts in it's trigger mechanism, which is easier to tear down and reassemble.

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Originally Posted by DPeter85 View Post
I just got my first Glock and have plenty of experience ripping these FCUs apart. I'm interested in seeking the differences.

I didn't find the FCU cumbersome at all. In fact, I was quite pleased with it compared to my VP9. It all comes apart down to essentially nuts and bolts with a pair of pliers. I am pretty mechanically inclined so if you're "all thumbs" it can surely be frustrating.

As far as spring life, I can't imagine anything other than the trigger return spring is supposed to be serviced at any regular interval.
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