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 threads into the recessed section and pokes through to the bottom.
- Using a bolt that fits the hole in the bolt carrier (the piece with the hole on the one end) screw in a bolt so that it forms a hammer end. The head must enter the main tube.
- Insert a split pin into one of the lower holes (the different holes give you different compression options.
- Drop in the bolt carrier. it should not be resting on the split pin, bolt head towards the roofing nail.
- Drop in a spring: mine is 35mm uncom