Hi all, recently I've been planning a rail change on my classic army KM12 however I immediately ran into an issue when trying to remove the barrel nut from my current rail as it very stuck on the receiver. I'll be honest and say this gun didn't get loved all that well so the nut has some surface level rust I do not know if this is part of the issue. I have read that heating up the barrel nut can help however I intend to use the polymer receiver beneath and am worried about damaging it. Does anyone have any advice on how I can remove it without doing any damage?