Well Mr. Sapergia, all I can say is I have a gun built from a semi-custom kit 36 years ago, that has NO rust in the bore and shoots as good today as it ever has. The bore is not left long enough to rust. The barrel is so hot after the flushing, the small of amount of moisture inside evaps, and before rust can begin, I have lubed the bore. The bore being hot, opens the 'pores' of the steel and makes it more receptive to the lube. I love to hear the varied information from all points of view, especially from those who have much more experience than me. But, I'm no tenderfoot, been doin it this way for over 36 yrs now. I'm not sayin everybody else's way is wrong or not as good, I'm just sayin it works for me. I can assure you the bore in that .52 is NOT destroyed.