Went, saw, got one of the cheap Well M4s they sell.
At the store in Orleans, they will not sell to anyone under 18, and ask for ID, name, and address/phone number.
They are painfully aware of kids asking to buy those to screw around.
As airsoft guns go, they are pretty crappy. But for simple display/demo where just looks are needed, they do the trick.
At a game, I would not trust that gun to do anything except make the opponents laugh.