The DryFireMag is the original dry fire magazine that resets the trigger in your pistol, so you can dry-fire practice without racking the slide between trigger pulls. Therefore, the practice does not instill the dangerous muscle memory of racking the slide between rounds. The DryFireMag not only resets the trigger, but simulates a true dry fire trigger-break by closely replicating the feel of your trigger. Since the DryFireMag does not engage the firing pin, there is no wear on it.