Ok
1. When u kill a guy with a sniper, keep the aim up. if u stop aiming he can see were u are by using the lame kill cam.
2. Deep impact- if u havnt noticed. if u just have stoping power on say hmmmmm a M40 or R700 it takes 2 kills in a limb shot. if u have deep impact its only 1.
3. When crawling move very slowly. keep ur head facing the ground.
4. recomended class:camp sniping- M40- M9 silenced claymore, smoke nade, stoping power, iron lungs or deep impact.
hoped this guide works for u