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Cracked.com is the Internet version derived from Cracked Magazine.  (You guys remember, the mag next to MAD that no one bought?)
ANYWAY, they have all manner of bizarre, twisted stuff on the site.  I found this link entitled,

7 Items You Won't Believe Are Actually Legal

(Of course, they then place legalese warnings about how some stuff MIGHT be illegal in your area.  And your guys, being gunnies and all, will believe they are!)

 The list includes Tannerite and GE Mini-guns...

Of course, Cracked isn't libertarian, and asks after every item "Holy Balls, Why is it Legal?"

Go check 'em out at the above link!

flamethrower

mini-gun