Here are a couple of Flashlight Weapons I found.
Tear Gas Flashlight
This Combination flashlight gun was invented by V. Merifield, of the Los Angeles police department. At the pressing of a trigger the device ejects a spray of ammonia or gas from a jet to disable any suspect who might attempt to draw a weapon when the flashlight is aimed. The gun weigh only six ounces, had fewer than a dozen parts, and was practically indestructible. Jet and light were controlled by separate triggers. One filling provides 20 shots of gas.
Source: Modern Mechanix; March 1937
Shotgun Flashlight
The ARES Defense Systems Company a Mag-Light Flashlight that can be used as a shotgun. A grenade-style pin removes the safety, and the flashlight fires a .410 shotgun round out the back when a button is pressed.
Shotgun Mini-Flashlight
The Mini-Mag size fires a .380 round.