From what I have seen on emails I get from friends in the US and on the U.S. Firearm forum that I'm on; the "not knowing" deterrent works quite well. I don't think too many of our knuckle draggers are armed with a firearm,a knife maybe, but being the cowards that most of them are, the sight of a short piece with BIG hole in the muzzle would make them wet their pants & run for it.
I was particularly trying to point out the deterrence factor of the knuckle draggers not knowing if you were carrying or not. That's supposing we ever got a law passed that would allow properly licenced FAL holders to do so IF THEY WISHED. I'm NOT holding my breath waiting for our elected superiors at Fort Fumble to allow us such a right!!!!
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