[SteveR]

The gun has been stored in a drawer in an old sock for the past 50+ years. Is there any particular kind of gun oil best to use? Also, would I need to disassemble the gun to apply oil everywhere, or just apply to the outside? Thanks!

That revolver likely didn't see much use or abuse, and the risk of damaging screwheads isn't worth anything gained by breaking down that 120+ year old Colt beyond removing the grips..I generally spray some Ballistol where I can reach internally and be done with it unless there's some active red rust visible..Some of us love to take things apart and others prefer not to risk stirring up a problem where none existed previously. .It's a pretty Bisley