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It's called quick scoping. It's difficult to do, but once you've mastered it, it's more effective than any other gun seeing as it's a 1 hit kill (depending on distance fired). Only way to do it is as soon as you see a player, scope and fire almost simultaneously.
Surely you're not advocating the 'sniper class' SC ;¬) There are far better ways to 'earn' your stripes.