n 1997, Bill Burroughs (a respected firearms instructor and law enforcement researcher, formerly of the Smith & Wesson Training Academy and Sig Arms Academy) conducted a study using the then-new Simunitions FX system. Burroughs looked at 157 police officers, 47 percent of whom were trained in the Modified Weaver Stance, 17 percent in Isosceles Stance and 32 percent who described their stance as “natural.” Burroughs put the officers through 188 dynamic training scenarios utilizing Simunitions in which justified use of lethal force was required. His study revealed there was a reflexive change in the officer’s shooting stance in a spontaneous use of force situation.
Only 19 percent of the officers adopted a Weaver Stance; 59 percent of the officers adopted an Isosceles Stance; 7 percent adopted a “natural” stance and the remaining 15 percent didn’t respond at all. In his study, Burroughs states,
“By observation, those that remained in Weaver had the opportunity to pre-select their stance before the scenario became critical. Most, however, were so shocked by the suddenness of the scenario that they demonstrated a pure survival response of squaring the body, extending and locking the arms, crouching the posture and viewing the threat binocularly to fire.”
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http://www.recoilweb.com/history-and-the-fighting-stance-30831.html#ixzz33RyjHcHo