Read post #3...I wasn't just whislin Dixie when I said my friend had his factory barrel cut to 16-1/2" and threaded.The OD is still too small at 16.5" to be threaded. I'm definitely going to have to replace it for a threaded barrel. I'd really like to hear more comments, especially from guys with a Green Mountain barrel.
You did good.I think your choice was a wise one.Thanks to all who replied. I went with the 20 inch stainless fluted. The reasons I went with the 20 inch barrel instead of the 18 inch barrel are because ithe 20 inch only weighs 1 ounce more than the 18 inch and Tony Kidd says that his 20 inch barrels are his most accurate.