Some of you may have already seen the TAOFLEDERMAUS video featuring the 12 gauge trip wire alarms. For those who missed it.
The alarms have a spring loaded firing pin held back by a cotter pin that can be tied to a piece of string. When the string is pulled, the pin is released and strikes the exposed shell.
Many viewers erroneously assumed these alarms could be used as a booby trap. While that would not only be illegal, it would also be highly ineffective.
TAOFLEDERMAUS is back to explain why with another video using those same alarms and various 12 gauge shells.