Don, a couple of barrel makers recommended the names of two
highly skilled gunsmiths willing to install a new barrel. One smith, Dennis Olson, is experienced with working on the BAR, and the other smith admitted that while he has never done a BAR before, he is willing to learn on the job. Where this admission of lack of experience would have ordinarilly scared me off with other smiths, I was impressed by this mans show of confidence and was inclined to go with him. (you suppose the name "Greg Tannel" makes the difference ?
) But I also haven't spoken on the phone directly to either of these gentlemen yet, so neither realizes that I wish to install a heavier barrel, or that I seek greatly improved accuracy. I was getting ready to contact them about it and get more serious about the project, but I checked back here first to find your warning.
After what you just posted here, I think I'll DROP THE WHOLE IDEA. I researched further to try to understand what you were describing, and now I see the mechanical challenges of the inherent design that you were trying to describe.
I think after 6 months and $2,000 of finding a BAR donor to tear apart, then having a custom reamer and barrel gunsmithed into my "dream custom BAR" , I'm going to more likely end up being very disappointed with a rifle of mediocre accuracy. While I'd settle for fairly consistant say 5 shot 5/8" groups, I wouldn't be surprised if I ended up with 1" or so groups. (some rifles are reported to do that right out of the box anyway.... I don't need to spend another $1,000 - $1,300 to acomplish the same thing)
BTW, did you ever get your crazy .75" MOA x 4" MOA accuracy problems corrected in your 308 BAR? Asa Yam was right when he jokingly suggested to you that you might just forget about it and get you a DPMS Panther in 308 cal. If I could find the 7WSM or 7mmMag in an AR platform, I'd have done that and foregone all the BAR investigation.
Thanks for the valuable input. You very well might have saved me a lot of money and needless time and trouble.