I've been reading the round count thread here and am curious...what is the maximum number of rounds that a 9mm HP pistol could fire? I see numbers between 1000 - 4000...but as long as the firing pin is replaced every 1000-1500 rounds or so, and it's regularly taken apart and cleaned/lubricated, how many rounds could one of these ultimately go through? 5000? 10,000? 1 million? What sets the limit, and what major parts may break or wear out to the point that they really have to be replaced?