Just an update. I finally took my 7600/30 06 all apart. I did have to use a heat gun to get the slide tube free. About the only thing I saw that I did not like was the plastic ejection port cover. I did not realize that was plastic, not that it matters. Got the barrel to what I believe is copper free with a couple applications of Wipe Out. Tomorrow I'll see how good she shoots with a clean barrel. I have put some rounds through sighting it in and it looks to be a 1 1/4ish shooter but there was quite a bit copper in the barrel, particularly apparent after the first application with wipe Out. Wouldn't mind a bit of improvement but I'll see tomorrow.
