Maybe the term is riffling or rippling. I will try to get a picture. It is not easy to see. It is on the bottom of one barrel only and it is not visible looking into the bores. I googled it and read some discussions on other boards which were not much help. Some said it was due to poor re-finishing and some said they had seen factory barrels with it and it was a result of not being properly finished at the factory. These discussions were not about Parker guns in particular.
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