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The fastest, most positive way to disengage the Beretta slide mounted safety. Summary: Center the pistol in the web of your hand, ie assume the correct grip. The thumb starts up high, bumps the safety forward with the first joint, and finishes in a down and forward motion.
For more Beretta knowledge, visit http://www.berettaforum.net
*My camera's LCD screen is shattered so I apologize for the off centered image.