If they were training with 9mm NATO, I can see how they were getting premature parts breakages. Most contract stuff runs around 32k psi and +P velocities(around 1250fps), depending on the country and year of manufacture. IMI stuff usually runs up to 36k psi and will throw a 124gr bullet almost 1350fps from a M9. That's +P+ pressures and velocity. We switched to only standard pressure 147gr eight years ago and haven't had any problems with our stamped slide Sigs meeting the 5k round service interval. The newer machined slides should in theory be better, but due to Sig's poor quality controls as of late I'd opt for a old stamped slide Sig any day.
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