Regarding your 16 parts, I have "heard" (but not seen in writing), that M16 bolt carriers in AR 15s are ok, much the same way that ATF (supposedly) said it was "ok" to have an M2 heavy bolt in an M1 carbine.
The hammer, if you want to use it, can have the secondary sear lug ground off to make it legal, but the remainder of the parts (trigger, selector, disconnector and "flip sear") I would lose.
Now, having said this, "I am not a lawyer."
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