Annealed receiver on a 7-41 Garand that never was rebuilt?

[RCS]

I have also received my GCA Journal today and read the article on the m1 that came from a B-17. I have studied the anneal colors for many years on
both Springfield and Winchesters. The photo of the rifle in question on page 10 is not an anneal color, the discoloration is not complete on the rear portion
the receiver. If the receiver was annealed the entire rear section behind the rear sight would display a darker color - this rifle was not annealed