I made this a long time ago and was asked to post this. Its nothing more than a slightly shiny and worn M4A1. The rifle has shading on it so as the light source changes, the shine changes. Compare the first picture with the rifle pointed up to the third picture with the rifle pointed down. I have other weapons I did this to as well and will post them if there are requests to do so. I have an Install letter in the ZIP file for instalation.