Remove the magazine brake, the hammer spring, then the sear cage and then remove the hammer. Take your starter punch and get the pin in the disco started which is installed on the bottom front of the hammer and then drive it out with a regular punch. You will not need the disco or the pin that holds it. You will need to remove the sear cage anyway to get your trigger changed out. You will need the starter punch to get the trigger pin out so buying it was a very smart purchase.