Interesting posts for sure. Personally, I carry a 9mm handgun all the time including inside my home due to all the home invasions today and also in my own neighborhood. As far as defense, one can go to the extremes. Knew a fellow years ago when I lived in CA. on Sacramento Delta area that did canvas work on boats. He spent 5 years sailing from West Coast USA to HI. then down to Fiji, Indonesia, Thailand etc. and other Islands then around the world back to West Coast.
For his self defense during that time, he carried couple handguns, rifles and I don't know how he got them but he did let me see them on his sailboat, 2 RPG's and an M-79 grenade launcher. Had them hidden well in his 45' sailboat contained in a water proof compartment he built between the hull and salon liners to rear of his fridge and stove areas. I imagine he picked them up along the way while he was somewhere in another country. I didn't ask, he didn't say. Some serious fire power for the hard core traveler.
He lived on his boat in Discovery Bay CA. for several years, made a ton of money doing canvas work, then off somewhere else. Name was Ken, a big guy about 6'4", ex marine, wore jump suits, full head of white hair.
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