First, I just picked up a decent 99F in 308, which I have wanted for a while.

Second, while taking the buttstock off for cleaning, I noticed this rifle has an aluminum stock bolt and washer.
I assumed some idiot put it in there, but Numeric has a pick of the bolt and it looks the same.
Is my bolt an original, or is it some sort of replacement?

Third, any other knowledge I need to know about these guns?