J. B. Bore Cleaner

I've found it in several different gunshops, and Brownell's carries it.

But be wary: at least one very knowledgeable barrel maker has strongly recommended against its use -- calling it far too aggresive as a cleaner.

(That same maker has a lengthy "article" about barrel break-in here on TFL; I remember the name of the message string, however. A search on barrel breakin might find it.)
 
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