Some shooters like to polish the internal parts, but if a pistol runs well, does not jam and is accurate, I like a hands-off approach. I think that the single most important thing a handgun (or any competition gun, for that matter) must do is go bang every time you pull the trigger. The more you mess with a functioning handgun's operating parts, the more you increase the odds of introducing problems with little potential gain. If it works, don't fix it. I believe in an ammo-gunsmithing approach to this chore. If you burn enough ammo, the parts polish themselves.