Relax, that stock is all USGI from the ones I have seen over the past 50+ years.

First, the round inset wood plug is a common fix for "flawed" military stocks that were caught before these same stocks were sent up to finish and install. Not a bad repair and certainly not a structural one.

The offside repair looks like the same material the military used to fix bad holes and gashes. I once took an M1D stock off a rifle to clean and found a giant glob of the same kind of material under the cheekpiece. I know the rifle came from government auctions in the 1990s, so I am confident that no Bubba is monkeying around with this stock.

The material is coarse and never really seemed to dry out thoroughly on the one I encountered. It was easily picked out of the hole and the stock cleaned and re-installed. It probably was an expediency repair for an otherwise usable stock.

If you are satisfied with your seller being upfront and the stock suits you, then it is OK. An honest stock with a little wear and typoical of HRA style stocks. But, all USGI was far as the pics go.