DanAK47, is the one who originaly used the alpha channel bug technique. Kyle Sarnik improved it and applied it to more practical uses.
What does it do? Here is a couple of videos, Kyles (AN-94) shows it better then mine
There are other tutorials there that might be usefull for crCTI.
// Writing some searchwords, dont care about what it says
Weapon Animation Recoil Flash Coat Alpha channel Transparency