Originally Posted By: dkindig
Video one: When the attacker goes down to the ground the defender still controls the muzzle. It is stated that since this is a "slide gun" it probably won't fire. Wrong! While the impulse that cycles the slide is surprisingly light and is easy to disrupt by impeding the movement of the slide, the round in the chamber will still discharge. All you're doing by disrupting the cycling of the slide is preventing the NEXT round from chambering. Again, not the focus of the exercise, but shows a basic lack of understanding of how the firearm works.
I think what the instructor is trying to say with the "slide gun" comment is that if the slide is retracted almost any at all, it will not fire. All automatic pistols or "slide guns" if you want to call them that have a design that prevents the gun from firing if the slide is not in the all the way forward, locked position. If the pistol did fire with the slide retracted, the chamber would not be sealed and the pressure of the round firing would cause a blow out or "kaboom" as it is called on the internet. A blow out usually completely destroys the gun and injuries the firers hand badly. Google "semi-auto pistol out of battery firing" if you want to know more about this.
Keeping all this in mind, it still isn't a safe bet to think that the gun will not fire because you are retracting the slide while grabbing it. Your hand could slip off (or anything go wrong for that matter) at the last second as the trigger is pulled and the gun could still fire. Like others have said, I still wouldn't try this unless you are convinced you have nothing else to lose and your attacker is going to shoot you anyways.
p.s. I am taking Krav Maga classes right now and they are definitely worth it! It is a full force, reality based, politically in-correct martial art that actually works in the real world. There is another reality based fighting system that works called "Progressive Fighting Systems" and the proprietor's name is Paul Vunak. It is another reality based, aggressive system that really works but it is hard to find an instructor/school. The original instructor, Paul Vunak is still available (if you are in California) but he is getting old and becoming quite controversial because of his personal life.