it looks like it's pinned to repair a split at the head of the stock. i guess from the pic it could be a spot of damage, but I doubt it
removing the stock will tell you for sure
whether or not you have an issue depends on how weak the stock was when pinned and how well it was done
sometimes it will last a long time - sometimes the stock is oil soaked and its only going to hold temporarily
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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