As the title states, I recently purchased my first HK pistol. I have owned plenty of pistols before, but this is the first I've owned with a tactical rail system. The gun has some gouges in the polymer due to the sloppy installation and removal of accessories. My question is, how can I remove these gouges. Should I take some high grit sand paper to it or should I take it to a Smith? The slide also needs to be re blued but that can wait considering this is my carry weapon.