Correct me if I'm wrong but the karambit comes from Sumatra where it was originally an agricultural instrument. It was said to be modeled after the claw of a big cat, like a tiger. It is used in the martial art of Silat. It is deployed both blade up and blade down, in hacking and ripping motions. The ring on the handle allows solid purchase and you can also punch while holding it. It's used with blocking and locking techniques, where a punch is blocked and the arm captured and then the curved blade is slashed on the arm, neck, thigh, or knee...or all those places in rapid sequence.
Oh no! The Karambit has much more provenance than that...
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First you have to understand it's use and no it's not brought to a gun fight so try to have an open mind.
A last line of defense at close quarters is what it's for and it's not the newest, latest thing and it's damn difficult to disarm and think what you want about it, when used properly can be deadly...
Like it or not, when the chips are down and lives are at stake, an armed citizen can be the "first responder." People who dont like guns invariably rely on people who have guns when their lives are in danger.