Purely a graphical issue. File was too large to upload on here so I put it on youtube. Only 23 seconds long. It shows how it ONLY happens on one side of the character. I was the only one who could see the issue. My friends were very close to me and it was not happening as they looked at my gun.

http://youtu.be/RL9NvYncdjc Video of it occurring.

My system is all AMD(CPU and GPU) Windows 7 64 bit.