12G Alarm

I wanted to make my own version of a 12G Alarm as I had a package stolen off my porch this Christmas so I came up with this one. In addition to the three components shown you will need a suitable spring, a couple of split pins, a roofing nail and a bolt that fits the bolt carrier.

Author takes no liability for any and all usage.

Here's how it works

- Mount the main assembly on a board or suitable location
- Drop a 27mm roofing nail (1.25 inches) into the main tube. Make sure it threa