HK USP Compact 9mm with LEM trigger. Got about 72K rounds through her total (LEM trigger put in at about 20K), and only started to have some malfunctions recently when I tried some reloads (I've never shot reloads in it before), went back to factory ammo and it's 100% again. Mag springs and recoil spring swapped out every 15K-20K rounds, extractor spring swapped out about 4K rounds ago (think that was part of the problems I had with the reloads), oh and the nights sights were changed about 4yrs ago as the old ones went dead on me.
"Four wheels move the body. Two wheels move the soul."