And I'm not talking a little warm, I'm talking hot! Let me start by saying I don't abuse my guns, but I do run my m&ps hard. I figure if they are going to fail it will be while actually shooting the gun, not just plinking around. I have 550 rounds thru it now and it is cleaned after each session. I have been using 115 gr and some 147gr. Multiple times now the first 50 rounds will be all over. I'll will have erratic ejections and what seems like a slower lockup. After the gun gets hot, it starts launching casings to a predictable 4 o'clock about 4' away and it seems as though it will chamber rounds faster. The hotter the gun gets, the better it shoots. The accuracy also improves somewhat. When cold it shoots about 2" low. When hot using the same ammo, distance, hold everything, it moves to about .5" high. My 40fs and 40c run the same hot or cold. I have to admit I haven't shot a lot of 9mm before getting my pro. Is this somewhat common to 9mms? Does this occur with anybody else's?