Five years late. . . the easiest answer is to kerf the recoil lug just down to the threads, file the kerf wider until almost through to the barrel shoulder and receiver, tap the now-split lug out of the bite, and unthread the now loose barrel by hand.
No torque or vise required, just costs a $5 recoil lug.
No torque or vise required, just costs a $5 recoil lug.