M16 Parts + AR15 Receiver?

And with the m16 parts + dias, does that allow selective and full auto capability, or full auto only.

It looks like your question got overlooked.

With a DIAS, you still have semi and full auto selectability. It doesn't work exactly like a true M16 because the selector doesn't disengage the auto sear in a DIAS like it does on an M16. But the disconnector works like normal, and thus you get semi auto function too.
 
I believe that if you install the FA trigger group in an AR and the FA selector switch, it can potentially slam-fire and doubble. That's a no-no.
 
It will fire in full auto with the selector in the third position... not reliably, but it will work. The problem is there's no sear to regulate the hammer so you end up with the hammer down on a live round.

This is what happened to the Wisconsin idiot. He had everything but the sear installed. It worked just enough to get him popped for an illegal transfer of a machine gun.
 
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