Taking money from someone under intentionally false pretenses is fraud. (18 USC ยง 1001.) Under the law, an intentionally and materially false statement relied upon by another constitutes fraud.
Intentionally meaning you did so under the condition you knew the weapons were fake and not real. Materially meaning the mis-representation of the guns as real was material to the transaction.
You could make the same case if you tried to sell someone fake drugs.
Not real drugs, right? Scamming someone who's going to something illegal right?
http://www.criminaldefenselawyer.com/legal-advice/criminal-d...
At the very least, it's fraud:
Taking money from someone under intentionally false pretenses is fraud. (18 USC ยง 1001.) Under the law, an intentionally and materially false statement relied upon by another constitutes fraud.
Intentionally meaning you did so under the condition you knew the weapons were fake and not real. Materially meaning the mis-representation of the guns as real was material to the transaction.