yes, painkiller is annoying.but what is happening is that you gather alot of attention, either by your footsteps or you shots.dont try to fire more than 2 shots in under 2 seconds at one person, its too loud.i reccomend you dont put on a silencer, it wont give you as much one hit kills, and i wouldnt sacrifice FMJ.i use ninja pro all the time, so that i can hear enemies footsteps better and they cant hear me.