Now I feel like a dummy. I misread your post and thought you were talking about gun weight.
I'm only 69 years old, so maybe I have time to learn how to read for comprehension ;-)

Not sure about the WD40 but I'm seriously considering Kroil. Remember the Old advertisement, "A little drop will do ya"? A drop of Kroil just might work thereby eliminating a drive to the gunsmith. But if it doesn't work...well then a drive to my favorite gunsmith is in the cards. Thanks

Maybe I should have emphasized "A DROP" of Kroil. I certainly wouldn't hose it, use very sparingly. One drop won't oil the stock down, will wick down into a mechanism and that stuff really cuts old lube, dirt, accumulated crud. Doesn't do much though for the ground oyster shell and Lab hair, common to coastal duck blinds!

Dan Cullity, Master Gunsmith, Sandwich, Mass. 508-888-1147

I have always tapped mine loose with a piece of wood, although I will not suggest you do it. It has always worked for me. Tap in the direction you want the selector to move. That, and a drop of oil, is what the gunsmith will do.