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Is that an auto sear hole in on that lower???[/QUOTE
I have no idea.
I think you may have an AR-15 with the internal aluminum block cap over the trigger assembly.
That third pin may be what holds it in place. And it is thicker than a auto sear pin. This started around 1993. And lasted only a few years I believe.
Also I don't think this pin goes through both sides of the receiver. Just the right side with the forward assist on it. [ This would make it very hard to remove. As you could not drive out the pin from the opposite side].
In any case I'm curious to know?
Is that an auto sear hole in on that lower???