Perimeter Defense; Do It Yourself

Humans have used animals, especially dogs, as their perimeter alarms for millennia. But hey, we are tool-makers, so we have come up with mechanical devices for perimeter defense.

There are all manner of military and civilian perimeter defense products. However, one cannot go down to one's hardware store and buy a claymore anti-personnel mine. Too, one may not want explosive wounding/killing devices at all.

But tripwires that set off .22 blanks or 12 ga blanks could really come in handy post-SHTF. Rattling tin cans is one thing but a 12 blank really lets everybody know that the festivities have begun.

First, there are products you can purchase:



Source
https://fithops.com/?msclkid=6150b5d3063a1112c08ad59d696e30bb&utm_source=bing&utm_medium=cpc&utm_campaign=Search - Brand&utm_term=fith ops&utm_content=FITHOps

Another company:

https://triggercannons.com/product-category/perimeter-alarms/

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OK, so there are a couple of commercially-available perimeter alarms that are available. Next up are the do-it yourself ideas.

 

Now let's start with the make-do crew of ideas for perimeter alarms.

Here are some totally low-budget jerry-rigs:

mouse trap 20 gauge


mouse trap caps


rolling ball makes contact inside syringe

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OK, what ideas do you all have? What make-do perimeter alarms have you used?
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I like these mega-sturdy strings from Atwood Rope, Made in America:

https://atwoodrope.com/collections/micro-cord

https://atwoodrope.com/collections/nano-cord

About this company:
https://atwoodrope.com/pages/about-us

 

Perimeter defense video

Garden hose w/nails in triangle formation



Stakes driven at 45 degree angle to deny enemy cover









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Tripwire .22 blank firing device

https://alarmmine.com/product/22-cal-sentry-alarm-mine-in-multicam/

https://bugoutexpert.com/product/4-...style-mini-sentry-airsoft-paintball-claymore/





You can by .22 blanks on the web

https://duckduckgo.com/?q=.22+blanks+for+sale&atb=v140-1&ia=web

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I used to always have a dozen of those old pull string firecrackers and small spool of monofiliment line in my back pack for night time sleeping security.
https://www.factorydirectparty.com/...oke-and-poppers/pull-string-fireworks-12.html