Greasing the hinge pins on double guns is the correct treatment.
However, the "Rotate-oil and slide-grease" holds for most other type guns.
This is most often stated for the M1 rifle in which sliding parts were greased per the manual.
The only thing I don't like about Rem-Oil is that it's very thin and tends to run off.
However, lubrication is argued to the point of absurdity. There is no "Magic" lubricant. What you lubricate with matters far less then that you DO lubricate.