Hello,
Yesterday the members of a similar Hungarian gun forum (http://www.gunforum.hu) made a real test of a gas-alarm gun on a human being.
The situation: The attacker (Toto, the brave, 120 kg, 1,90+) and the defender (me) are standing in front of each other. The distance is exactly 3 meters (measured).
The task: on the IPSC timer's BEEEP, the attacker have to run and stab me with a simulated knife. I have to defend myself with a gas-alarm gun, and run away, avoiding the stabbing.
The gun: factory-new totally standard Rohm RG89N in 9 mm K (as a common, affordable piece). Loaded with Umarex 80 mg CS and 120 mg PV cartridges (CS-PV-CS-PV...)
4 rounds was enough to stop the attacker. A small "emergency team" waited him with water, camilla-tea, eyedrops, shower etc. It takes 5 minutes even to be able to open his eyes....
Watch the videos (from different angles):
http://www.gazpisztoly.hu/video/teszt.mpg
http://www.netlista.hu/toto.wmv
And some photos: