We did some fire extinguisher training recently at my place of business, and I was truly impressed by the volume of opaque cloud generated by a properly discharged fire extinguisher.
You can purchase all manner of accessories to bolt on to a firearm - optics, laser sighting devices, flashlights.
I propose a small cannister of the same materials that fire extinguishers contain, highly pressurized to discharge in a moment at the touch of a button.
If you can blind your opponent in this manner, you may be able to avoid the need to shoot him. If he flees, identifying him shouldn't be too difficult.-- normzone, Dec 30 2009 since you're not actually putting out fires, why call it a "fire extinguisher accessory" ?-- FlyingToaster, Dec 30 2009 Edits in process. The marketing department was eliminated in the last round of layoffs. The floor is open for suggestions for catchy product names.-- normzone, Dec 30 2009 Title edited - I wonder how often a fire extinguisher has been used in an offensive or defensive manner. I checked youtube - lots of kids playing with them. The initial spray is the most powerful, once you start turning them on and off it's not that impressive.-- normzone, May 01 2011 How did he get shot? "well, officer, I was trying to put out this fire and..."-- DIYMatt, May 02 2011 random, halfbakery