I've a 19 I bought in 1991 or perhaps 1992, can't remember but I do know its past 12,000 rounds and still going. I've replaced the recoil spring assy and trigger return springs three or four times, magazine springs and followers in the five magazines I have twice and the night sights that finally went dead. Other than these, nothing else has been done. I think mine gets better the more its fired, the slide and trigger are both silky smooth now. Very little finish is left on the slide, not a problem it still won't rust.