I have never had a gun with any rust problems but this appears it may be the case. I also read that old oil would leave an orange stain. Any help would be appreciate on treatment.
thanks
gary

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IMO, your looking at rust. That's not an area that is normalle exposed to a lot of oil but it is an area where water could become trapped and cause some rust. However, just on the off chance it is dried oil residue, soak a cotton cloth with some mineral spirits or WD-40 and see if that will wipe off. If it wipes off and you don't see any pitting or loss of blueing, it's just a stain. If it has rusted, touch it up with some cold blueing and make sure to keep this area waxed or protected with oil.

RUST, That part of the gun doesn't see much sun light so it's not a tan. Remove all the brown stuff "RUST" and oil if you leave any brown there it will keep eating away at the metal until you remove all the rust completely, and don't bother with the cold blue it will only make it harder to see any rust that will re-surface.

FYI: Consider investing in a new flashlight make sure it's one of the super bright LED type (150 lumens or better). When you shine a light that bright on any blued gun it will revel everything you don't want to see on your gun.

When guns are stored for any length of time I go over them 1st with a lightly oiled cloth. If they seem to damp for you next outing you can use a dry cloth on them. A used gun with an unknown history gets a look at internals before to long. That would mean the side plate off on a S&W handgun. The same thing after a hunting season with excessively wet conditions.

I just had a similar post with a Colt Detective Special.
I simply removed the crane housing screw on the right side and the whole crane assembly slides out.
A little effort with scotchbrite and new oil should solve the proiblem. It did with mine.
There is a small spring and pin under the screw (at least on the Colt) so be careful not to lose those.
Good Luck!!

Get a proper fitting hollow ground screwdriver and carefully remove the front side plate screw on the right side of the gun (no spring to worry about). The screw retains the yoke, so make sure the cylinder is closed when you do it. After the screw is out, lay the gun on its right side, open the cylinder, hold the cylinder in one hand and carefully slide the yoke out the front. Clean all the exposed surfaces with solvent and bronze brushes and use a small bore brush to clean the hole in the front of the frame that accepts the yoke stud. Make sure you wipe off all the solvent after cleaning and apply a light coat of oil to all the surfaces.

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