I love spawning as a sniper just to counter-snipe the guys on the crane. Not much room to hide up there. Same with guys on the Hotel roof on Karkand, and TV Station on Sharqi.
I don't go all the way up to the top of the crane staying on the section just below it provides much more cover including metal rails which often deflect bullets. I have sniped there 3 rounds now and have yet to be sniped back, a dude did climb the ladder and knife my face though and a helicopter got me.
The great thing about this spot is in order for another sniper to get you they have to do it in 1 shot as soon as they shoot and miss I can swing to the other side were they can't get me unless they run across the entire map.