yes, Briman is correct. I also have a couple brownings that do this. My Remington 7400's and my 7600's do this also (They almost appear oily after they are wiped off). I too agree it has to do with the type of bluing oncertain guns.

I dont think its much to worry about as long as you are using a good quality gun oil. And you are if you are using rem oil.

Good luck.