Who made those AR .358 barrels?
I have a Smith in SC that makes them for me. I drop ship the blank (GM) and the extension (Lilja), email him specs. Get the barrel back in about a week. $125 plus shipping to me. PM me if you need more details.
In some cases he already has the reamer... in the case of .358W I had 4D drop ship him the reamer (rental was $33). I already had Go No-Go .308 gauges.