Bruce Gray also sells his trigger pack which is supposedly what Sig is using. His website often shows sold out though because I think they are mainly selling direct to Sig now.
So many temptations! Damn you DOC for starting this thread!!! :)
---
I went looking for Sig stuff today for fun and found a totally legit add on Armslist. I had no idea the P228s took batteries.
Can people even use Armslist anymore?
https://imgur.com/xTL19gM.jpg
ETA: I'm pretty sure that is a P226 mag with a bumper (non-compliant) too.