Re: McMillan M-86 Barrel re-placement
Pretty fair bet if yours is very old, it is pre Schneider. I don't think Gary was cranked up when some of those were run. I may be wrong but Gale McMillan was making barrels at one point around then and they were also putting some Harris or other on for a short while. If it was an 80's era gun, might have a McMillan barrel made by Gale.
Call Ryan McMillan with your SN and description. If he can't give you the details, he could hook you up with one of the older guys around there that would know. Dick Davis may be really tough to catch but I think he could tell you for sure also.
They are straight up easy to rebarrel so you shouldn't have any worries either way.
Good luck