Yesterday afternoon I spray the insides of my frame, front to back, with CRC HD Corrosion Inhibitor. The stuff is apparently kind of like liquid cosmoline that dries to a tacky finish and is hard to get off without solvents. The 4R is a month old and hasn't seen any salt. Looks like I'll be doing the outside of the frame as well.
/ garage smells like a crateful of Mosin-Nagants now