I broke it down 3 or 4 times the trigger pull (ala glock) way. Looking in there I discovered the yellowish thing, and flicked it around trying to figure out what it was...I decided it was the leftovers of a vestigial mag safety without spring.
Someone said trigger pull-breakdowns COULD hurt the firing pin, but they seem to have erased that post. I will continue to ignore the yellow thing until told otherwise. Once you get to it, it's an empty gun anyway.

As a glock guy I'm not a fan of extra parts (more stuff to bend/break--so far, I've only read of one case where the spring holding this over allowed it to move too much and mess things up). I'm also not a fan of wisdom teeth, appendixes, and tailbones.