That is the rifling in the end. Looks normal I wonder if previous owner could have messed up the Barrel crown a little. Again not a hard job but if you had a guy that does them would be better. Take the shroud end cap off make sure the barrel is in the block properly and tight and see what she does.....a guy not knowing how to properly clean an airgun barrel could ruin the crown if he used a cleaning rod from the front. How much has it been shot? Any signs other than the mod being opened up? Scratches on the barrel shroud end cap loose screws......
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