It will normally take a lot of shooting before a barrel gathers enough lead to notice. But the instructions and description are correct. Put some good gun solvent that removes lead on a patch. Push that through the barrel and inspect it. You will see small flakes of gray dust like stuff on it. That is leading.
I use Birchwood Casey solvent and a nylon brush every so often on my barrels. whether they need it or not. And have never had a lead build up.
When it starts to lead you will see a decrease in accuracy.
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