I bought a HK USP Compact 9mm 2 weeks ago. It was made in 2003. If you know HK's , you'll notice that I changed out the "bobbed" hammer for a "spur" hammer. I like spur hammers. I've put about 100 rounds through it and really like the way it handles. It's sights are very small - hard for me to see. Any advice for me on changing the sights?