Lawndart......I venture to say, that a new Glock in calibers of 9mm Luger, .40cal Smith & Wesson will last you some where in the 200,000 rounds fired. The .357-Sig or the 10mm may not go that far, simply because they are more horsepower but that is NOT a given, just my own personal conclusion OK.
Glock did a test with a 9mm Luger, firing it over 250,000 rounds and the pistol was still working with NO JAMS or Malfunctions or any kind. The average handgun owner might fire 2000 rounds a year, so that is several generations to come in your family. I have friend, who has had a Glock 9mm Luger for over 18 years and he has well over 300,000 rounds put through that pistol. He has replaced ALL working parts with Glock factory parts only. His pistols shoots 2.5 inch groups at 20 yards!