Claymore mines are terrifying. Most commonly, though, they are used in large open areas and may be problematic if your home is not rural.
Claymores fire steel balls at a wide 60 degree angle. It's stated that they are guaranteed a kill at 50 meters but can still be dangerous out past 150 meters.
While claymores are often depicted as being laser or tripwire activated, they are most often activated using a clacker detonator held by an operator. They can be rigged to detonate via both electrical and mechanical means, so they can potentially be activated by a variety of methods.
There's many different types of moneyless economies. Just gonna spitball a couple ancient ones at you.
In a gift economy, individuals will create things and share them amongst the the community. These gifts just keep being given over and over, and not reciprocating a gift eventually leads to poor standing.
In a community stockpile, everyone works together to collect what others need. A group essentially tracks the stockpiling and helps determine how the stockpile should be used, such as in times of low yield.
My understanding is that Marx believed that there'd eventually be a day when people would essentially do group-makes for whatever they needed or wanted. Basically no money or anything - one guy would go "I want this", he and others would volunteer, they'd all work together to design a fabrication process, and then would all make as many of the thing as there were those who wanted it. A completely volunteer process.