Competition guns, Perazzi being one of them, are built like tanks. Good materials, lots of it, close tolerances, good finish on working surfaces, and they last forever.
You can get Perazzis with leaf or coil hammer springs. Leaf springs are considered to deliver a better feel and more consistent hammer fall. They do break from time to time, whereas coil springs get weak with time. Most people with leaf spring trigger groups carry a spare set, and they can be replaced in two or three minutes. Breaking leaf springs every 5000 rounds is unusual. I suspect an informal straw poll of the faithful would give numbers more in the 25-75K range. Other than the leaf spring deal, I don't know that Perazzis have a weak spot.
How durable are they? Olympic and World Champion Kim Rhode has notoriously put anywhere from 500-1000 rounds a day through her (one) Perazzi for the last 10-12 years.
