So never ran into this one before. Moderate pressure won't budge anything, don't want to force things.
I've never broken down an ambi selector before, wondering if I'm missing something obvious.
https://i.imgur.com/3SWWR0K.jpeg
https://i.imgur.com/7hGIOsM.jpeg
https://i.imgur.com/3mbc1jy.jpeg
https://i.imgur.com/bm4gbWp.jpeg
Obviously with safety engaged, trigger won't pull and can't drop hammer.