Sparing us the obligatory posts like like, "Option one is to run away,etc."- But if you absolutely had
Check out this and other similar fare available on youtube and google videos. http://video.google.com/videosearch?...-8&sa=N&tab=gv
We established in "What is combat?" that Aikido is not traditional Jiu Jitsu but these are aikidoka doing gungrabs pretty convincingly. I usually enjoy hearing what the members have to say about this kind of thing, so.... Ready, set, post!
PS: Also if someone who can translate the Japanese text in the video can say if it identifies what style it is.
IMO, whatever art or techniques you choose to work with when practicing handgun take-away techniques, I might suggest there are some guiding principles that should be present.
A fight over a gun is just that, it is close quarters, it is as volatile as a Judo, Jujitsu, MMA or Kali match with no rules, and the gun will most likely discharge at least one time.
Thus, here are a few principles to include when developing your tactics and techniques:
1. Contain (grab or trap) the weapon and do not allow the muzzle to point in your direction. Even if you are flipping someone in the air. Never allow the weapon to "cover" you.
2. Instead of the traditional acronym GUN - Grab, Undo, Neutralize) you may include GNU - Grab, Neutralize (koppo), Undo. You may also use this formula: Grab, Point
the muzzle toward the opponent and simply Jerk
hard enough that the person who has his finger in the trigger guard gets an autonomic reflex in his trigger finger..
3. Autonomic reactions cause the trigger finger flex automatically and will likely discharge the weapon. If you grab the slide of an semi-automatic handgun as part of your containment tactics, the weapon will only fire once. Then it will experience a type 1,2, or 3 malfunction. It will not be able to fire again until the jam" is physically cleared. Nevertheless, the weapon is still an effective club. (There is a myth running about in martial arts circles that the heat and gasses of a discharged weapon will burn your hand if it is holding the slide. This is not true).
4. The direction of force you apply to the weapon hand has a lot to do with flex response in the trigger finger. Techniques that flex the wrist (kote haeshi, etc) will make the trigger finger flex. Upward techniques will likely do the same. Techniques that cause the wrist to extend are less likely to make the trigger finger flex. Downward (verticle with no flex or extension in angle) motions are also safe but rarely practiced.
5. Which side you move the weapon is important for a second reason. In most traditional techniques (again assuming a right handed handgun), if you push the weapon to your left, you have a better chance that the discharged round will not hit you (30%). If you push it to the right as in kote gaeshi, you have a 70-80% change that the discharged round will strike your torso.
These are a few of the principles I subscribe to and am anxious to see if other principles are available from the other readers on this forum.