I recently purchased a model 66, 6" barrel in stainless. The trigger and hammer feel gritty. This gun being new I assume this either dirt from shipping/storage, or possibly roughness from manufacturing. I am planning to tear it down and wash all its parts and see if it is any better. Are there any parts in particular I should look at polishing? The inside of the frame looks pretty rough, but I don't want to get anything out of tollerance. I have lots of rifle and shotgun experience but have never worked on a revolver before. Is this roughness common to the SS models? My other taurus is a blued model and pretty damn smooth.