22,000 rnds. The Sentinel is the "old" Sentry I believe. I freshened it up a hair last year with a new hammer/sear/disconnector and a Briley bushing. Short, long, semi wadcutter lead, jacketed, White Box, major minor,etc, etc. It runs them all at 100%. Never, ever had any sort of problems. I run a ISMI 12.5# recoil and a 17# main spring. Cannot say enough good about it. I think I paid $1,438.