Remove the hammer pack and lube all of the contact points with Remoil, or any other synthetic lube. It will greatly improve the trigger pull. It will remove the gritty feeling, lighten it some, and smooth it up considerably. If you are comfortable with further break down, remove the trigger rods and polish them to a high luster. It feels like a new trigger at this point. You can also install a Neutrigger, look it up. It accomplishes the same thing by smoothing the hammer to sear contact points. Enjoy it.