Are Flamethrowers legal? YES!!! In fact, in 48 states they require no background check and can be shipped directly to your door! (Not legal in California or Maryland, sorry).
This is the very popular Pulsefire LRT flamethrower, which is battery operated and runs on regular ol' gasoline. 25-foot range with arc ignition, safe, dependable, fun and functional! Can be used to melt snow and ice, burn weeds, etc., lots of practical uses.