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Based on your photos, I would look closely at the jug walls, also I would check the clearances (piston to cylinder. ring gap). After checking clearances, you'll know if the jug can be refinished (honed) or if everything needs replaced.
There looks like some metal transference, but it doesn't look like the skirt has damage.
It has signs of excessive blowby like the rings never seated or it was allowed to sit too much without starting and running.
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