What a fool. Only the lower receiver would be made of plastic. The remainder of the rifle, the upper receiver, bolt, the barrel, and all the internals to the lower are still steel and easily detectable.
The barrel appears very thick to handle the pressure but I'm sure it wears slightly after every shot. I'm very curious how many rounds it can fire before breaking.
This is the first model and anyone if free to try it and contribute. The design WILL improve quickly so I'm sure Chuckie and his ilk are filling their pants right now.