I already saw a video about it and believe me that's not a problem for me. I already learned to control 100% of the G36E recoil and if you shoulder peak me, the only thing you will get is a headshot. You will kill me the first time or 2 then I will make your brain fly, I do this all the time with players croushed behind the boxes in Death Room, LoL!
headpeakers are slightly harder to get
but i know people who get them easily too
i tried headpeaking a wogl player he got me 6-1 :C