I feel that this would come down to more of a "what they don't know can't hurt them" aspect, as opposed to an actual Legal/Illegal aspect. As long as you're not brandishing it in open view of someone who doesn't know what it exactly is, then it's okay.
Like was stated, on your own property, out of the public's eye, and where everyone around knows what you're doing; then by all means have at'er.
Lest We Forget
Originally Posted by pancakedestroyer
Watching videos and reading a book means dick all. By that thought process I can read a book on advanced physics and Kung Fu and make rockets that could round-house kick mars