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Get a Deagle. They're really great if you're good at getting those headshots in one try, and should be no problem to conceal:
My second choice would be the trusty old AK-47. It's really great if you keep from spraying with it and do controlled bursts to the head. Concealment might be troublesome though.
Finally, if you're a real balla, I would consider getting an AWP sniper rifle. If you hit, it's an instant kill! Concealment is a big issue here, but you'll be camping behind a crate anyway so it's not like it's gonna be a big problem.
[/ QUOTE ]obviously the OP wants to quickscope his opponents