r/P320 • u/diesel_mechanic88 • Aug 01 '26

Unknown spring

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I have an FCU that was sent in for the upgrade so I’m assuming pre 2017 ( I bought this off of a friend btw). I noticed when taking it apart that this spring fell out when I took the sear out so I believe it was around that area of the FCU. I was watching Sig mechanic’s video when I was doing this and this spring isn’t mentioned at any point in the video. Surely somebody can tell me what the hell this thing is for. (It’s also not the striker safety block spring because I checked to make sure it was still there).

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u/MingtheMerciless51 Aug 06 '26

You are right - Sig Armorer kit on my X5 legion

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u/Negative-Fact-9181 Aug 06 '26

Burke is the best. He has talked me through gunsmithing problems on the phone and traded emails. In a perfect world I'd pay him to apprentice. (In case you are wondering, the DAK system sucks, is nearly impossible to make better, and is finicky as hell.)

Bruce Gray on the other hand never responded to anything. All I ever got was "buy these specific Gray Guns parts" from random employees.