Okay, there's no way to be nice about this.
If you dont know exactly what parts were changed, what each part does, what a sear is, or how to do the work... just dont. Go find an expert, let them do the work, and watch how it's done.
It's painfully obvious that you should not do this yourself.
We cant guess answers for you when you cant provide the basic information in your questions.
If you think I'm saying that because I know better, I'll let you know that I always ask other folks about fixing a gun I've never seen before, or opened before.
There's no shame in this, just a chance to learn.
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