Jim:

OK, I just re-read it. He says $3.5 to $4k. That's J. J.'s standard charge for sleeving (using the old barrels to make a monobloc). Sounds like what you're speaking of is something on the order of a full-lenght liner, maybe something on the order of "Parker-rifling"? To my knowledge, J. J. has never offered this, nor am I aware of anyone who currently does. It would be wonderful if that option were available. Maybe J. J. is offering something new?
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