actually a lot, but most people are talking about the Firing pin block system that was placed in the series 80.
its simply a preventative measure IF you accidentally drop your chambered 1911 on its muzzle from about 18 feet in the air this will prevent the firing pin from moving forward with enough force to pop a primer .
a solution in search of a problem to solve !!!
generally speaking a series 80 will have a bit more creep in the trigger and not quite as smooth due to the additional parts/springs associated with the system.
to me its not a deal breaker either way with a carry weapon.
Ah thanks. I knew it had something to do with the firing pin but didnt know exactly what it was all about.