I once asked Mike "what phantom accessory or improvement not made by you is the best?" He said, "if you can find them, the two piece phantom threaded barrels for freak inserts." I thought that was an interesting answer. Mine is freak bored, and I think that works fine.
There is some fear that the freak boring weakens the barrel too much. I don't think it does, but I have had a different freak bored phantom barrels that did not screw into the body as far as designed. You may want to measure the barrel, and you could request that the person boring it makes it the same length after the freak insert is inside of it. I think some guys are a little scared to bore it that far.