This is actually kind of sexy. If you use your default because you like it or are just stuck with it you may like this.
Yes I made this so no I did not leech this. I did not look to see if there was such a thing anywhere but the M16 isn't so popular so I doubt it. Also the .zip only contains the .rez file. You should always save copies of your original Nexon files before replacing them.
Instructions:
Navigate to Nexon/Combat Arms/Game and replace the original file with the attached file.
I should add that the photos don't do it justice either. I don't know why but it looks better live, in a game, than in a still photo.