Don't worry about the blemish, it'll blend in soon enough. HK's overall are excellent weapons. I've owned the 40 compact and still own a USP40 full size. I went from the 40c to a USP45c and now carry the HK45C. They are all reliable and accurate beyond my ability. Good luck with your HK and enjoy. One warning, once you get used to your HK USP40c you're going to want more HK's. The HK USP was initially designed for the 40S&W so you've got the ideal platform for the 40 cal. The full size 40 would be a nice companion for your carry piece. One for the house and one for the hip.
Enjoy!