H&K USP .45, great gun right out of the box. You can get a range of ammo from 230gr. to 165gr. hydrashok, with a range of speed and force. All depends on your intended target. Colts and 1911's are fun and accurate guns, but have some issues with stovepiping, failure to feed, and failure to return to battery. I love them for competitive shooting, and love single action only, but for that one time you need it to fire and keep on firing, the H&K won't let you down. Do a google search and see what you come up with.
Best of luck!