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Mike, trigger slap is when there is extra front to back vibration every time the pistol is fired. Over a period of time it would wear a blister on your finger pad.

A source stated the following: "Trigger slapping is when the trigger finger loses contact with the trigger as both move forward after a shot is fired. This type of trigger slap usually is violent enough to move the muzzle even farther off target as the bullet exits, resulting in a less-than-desirable group."