Dave didn't recrown it he just told me how.. pretty easy really..Ill walk u through it..
First you gotta stick a 6mm brush about half way down your barrel .
Next take your stainless steel Ivy cleaning rod (must be stainless) insert it into the muzzle, now with the palm of your hand start beating the handle end of your (stainless steel) rod. The stuck brush should create enough resistance allowing the (stainless steel) cleaning rod to polish the crown for your new barrel.
Thas about it, next time your at the range give it a try..