Ok Sonny Crockett, other than some work on the trigger, it has a long pull, maybe change the grips, other than that it is a big, heavy, shiny gun that needs to be shot a lot. Go here. This thread pretty much covers it.
Good purchase, I've found the 645 to be an all around good gun. Being on the heavy side there is little recoil (for a .45 anyway) and is a blast to shoot. Magazines are still fairly easy to find. Shoot it a lot and post some pics when you get a chance.
Chance favors the prepared mind