This is a tip on how to get more headshots. It may work for you. It is not hack. I am sure most of you have heard of the white "chams". Instead of making everybody white, I thought maybe you should just make the head white.
1. Go to Nexon folder
2. Go to Combat Arms folder
3. Go to Game folder
4. Locate the files named Chars_T_Face.rez and Chars_T_Head.rez
5. Move these two files into your BGM folder
6. Exit out
7. Open Combat Arms
8. Go to Shop/Storage. You should see your character's head white. This might help you get headshots. It has for me. I have around 20% headshot. Not aimbot but still effective.
Here is a screenshot of how it should look.