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Trying to push back on an opponent's slide to momentarily disable his gun is like trying to jump into the dragon's mouth to momentarily put out the fire. Not recommended.

If you're close enough to do that, you're close enough to do half a dozen other things that involve getting the gun pointed away from your body and snapping the opponent's finger bones. Or stabbing him with a knife. Or plucking out his eyeballs. Or administering a swift kick to the nads. Or crushing his larynx. Etc., etc., etc. If you are close enough for physical contact, then the best defense is a good offense.