I would not out of neccesity so much as all the stuff the factory puts on is kinda sticky gummy because they don't know how long its gonna sit on a shelf before it is sold. I would bet it would run but it is easier to clean the gunk off before you have it gummed up with powder residue. Personally I also always rub all the contact points and moving bits with revelation gunslick for the first few cleanings and first few thousand rounds. it builds a fine slickess into the metal then I occaisionally re apply it on a semi random basis perhaps every 5 thousand or so rounds. Note it is not a neccessity just what I do. And it seems to work for me but then I had guns before I started using gunslick and they all ran good too.