That's a nice, shooter grade Model 28-2. I would not use any abrasive on it as the Model 28 was factory finished in a satin blue. Abrasives will thin the already thin layer of oxidized steel (the blue finish). Matte and satin finishes have tiny high and low spots on the surface of the metal, the abrasive will take more off of the high spots than the low spots, the end result can be a very thin looking blued finish. I suggest a good cleaning with solvent, then oil, RIG, or wax (pure carnauba wax, Johnson's Paste Floor Wax, or Renaissance Wax).