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AR15.COM
5/19/2015 12:12:18 AM EDT
JP has no industry forum, but I figure guys here use them.  What is the break in procedure for them?  I had heard they were already lapped whatever that means.

When would I put a copper cleaner down them?
5/21/2015 7:16:38 PM EDT
[#1]
Straight out of their owners manual.

"Your rifle has been test-fired for function, but the barrel has not
been truly broken in. We recommend the following procedure
to obtain optimum accuracy potential from your barrel. At your
first use, fire 10 to 20 rounds and then clean the bore using
solvent and J-B® bore compound, which will have a mild lapping
effect in your new barrel. Follow this by mopping the bore using
a clean cotton patch with a little more solvent. Repeat this
procedure every 20 rounds for the first 60 rounds, then again
after the next 300 rounds. The J-B® compound is not necessary
for every cleaning, but will also serve as an excellent copper
fouling remover when necessary"