I did polish the feed ram, although neither of mine ever gave me feeding problems. I also polished and fitted all of the trigger mechanism. Ran a light polishing compound down the bore and into the chamber to remove any burrs. Polished the firing pin tunnel and slide mechanism. The tunnel where the firing pin and spring sit on mine were very rough cut and the polishing made everything move smoother.
This all made the gun feel much better and improved accuracy. I may do a little more trigger work as I thing there is a little more room for improvement there.
These guns are incredibly simple and it is easy to identify improvements once you have them apart.
I am working on a mold for some custom softer urethane grips for mine (for the 9mm and the larger frame 40). Would anyone else have any interest in these? I suppose they could be done in different colors as well. Any Ideas?
Have Fun,
JSF