I have reworked my icon. I have put a six in it and the gun is now on the lower right corner of the icon. Unfortunately, I don't have the skills to draw some bullets on the drum but I think it looks good as it is.
PSD fileFor
The Specialist achievement (still a WIP and the grainy texture is on purpose; feedback greatly appreciated):
PSD file (if you think it's good enough)Fun fact: that's Adam from Mythbusters but he looks vaguely like Mishkin because of the hat.