Thanks IG
I need to clean the nut at the end of the extension there is freaking loctite thee too my hammerhead wrench will not fit on. I am going to tap it on. Then I will heat it up as you suggested. I will report back! Applying the oil right after the heat is a good idea.
This is an M16 A1 lower we have two with the same red loctite treatment. Is this an arsenal rebuild thing? I did not think so but could be wrong. It is an pretty new A2 stock. The last one had to be carefully cut off with a torch. I just heard the story today and was a little concerned to hear the rear or the lower got "cherry red" any worries there?

