I've done a lot of sig detail stripping and reassembly...
I'm wondering if the click you're hearing is maybe something related to either the the trigger return spring not installed quite properly, or maybe a nick/burr on the trigger bar itself.
This is pure speculation though. I haven't actually experienced this issue.
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Handguns: 2x Glock 19.4 | Glock 26.4 | HK USP 9 | HK P2000 | HK VP9 SK | HK P30 | CZ Shadow 2 | CZ P-10 C | CZ P-07 | CZP-01 | S&W 360PD
Rifles: DDM4 | SGL 21 | SAM7K | Draco | PSA PDW SBR | ASA Side-Charger SBR | CZ Scorpion K SBR | Aero M4E1 9" 300blk SBR | Angstadt Jack9 SBR | Savage Mark II FV-SR
Shotguns: Mossberg 590A1 20" SP | Mossberg Shockwave
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