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The 21-Foot Rule: What Does It Really Mean?

Most people in the defensive-shooting world have heard of the "21-Foot Rule," often practiced as the Tueller Drill. But what ramifications does this have for the armed citizen?

The 21-Foot Rule Revisited

In 1983, Dennis Tueller, a police officer, published an article discussing the need to defend against an attacker armed with a knife or blunt weapon. Through his tests and studies he determined that a person would be in danger if the attacker came at him from 21 feet or less

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