The amount of over travel can be adjusted by the little hex head screw that is located in the face of the trigger. Adjusting the pull weight or the crispness of the pull requires modification to the hammer, sear, and springs. Don't attempt this unless you know what you are doing. Too many horror stories of botched trigger jobs resulting in loss of reliability or full auto firings. I personally know of one full auto incident and no, it was not my gun!
