Dave, I have had a few apart and never had to heat anything, did not see any sign of locktite.
Interesting.. Only time I don't need heat is when it's been taken apart once before.. But if it's a virgin factory rifle, heat has always been necessary, as described above just enough to melt the loktite..
While it's apart, don't forget to lube that O-ring before reassembly..
Ex- USN (SS) '66-'69 Pro-Constitution. LET'S GO BRANDON!!!