The best sniping map is derail IMO. Get to the center warehouse, plenty of windows and only two narrow entrances.
I get claymores and Scavenger, set one on an entrance and go to the other side of the building. If someone dies near you, grab the pack and place another claymore at the other entrance. Even if it doesn't kill the enemy it will only take one shot from a pistol or machine pistol to finish.
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