Got the Geiselle Reaction Rod into from Brownells....
Removed three FHs in no time, the best tool I ever purchased.
Saved the Larue 556 for last. I knew it was going to be a bitch, as the shop that installed it for me used Rockset, told me after they installed it. Should have had them remove it right then, but did not, was in a hurry.
Mounted the upper on the rod, hunkered down on the FH with a 3/4" wrench, same one i have been using, nothing, this thing was not budging....I tried two more times, even though I am 60, I have some brute...I was a afraid I was going to twist the barrel...
So went inside, asked Ms 77 to fire up her custom Le Creusete kettle, hung the upper in the garage, let it hang in a 32 oz cup, poured full of boiling water and let it sit for exactly 25 minutes. Went out took it down, mounted on the rod and the FH came right off, easier than the FHs without any kind of loctite
So, I can tell you first hand the water works....boiling water appeared to be better.