I got an adjustable wrench and still would not budge. One problem is that the nut has rounded corners caused the wrench to slip. I'm thinking they have some kind of thread locker on the threads. My disposable blow torch ran out of juice, so I'm going to have to go to home depot.

Home depot did have a channel lock type wrench with angled jaws so that 4 sides can be engaged at the same time. this MIGHT work, or I am still wondering about drilling a small hole in the nut for a a C-hook spanner wrench to engage.

Last ditch effort would be to see if Savage would sell me a replacement barrel nut and hit this one with a pipe wrench.