Those marks on the rear of the cylinder appear to be firing pin strikes. How this could be possible is a bit baffling but I suppose that if Bubba removed the hand or hand spring it might be possible.
From the condition of the rear of the cylinder it appears that we aren't talking about a 98% condition collectable. If this is a routine shooter I would use a stone to remove any high spots, that should resolve any drag issues caused by this.
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