We have been playing with making G3's and 9's in nylonX. It has melt temp of something around 400 degrees. NO, you probably cannot go rip off 30-40 rounds of 40's and expect no issues. It IS not metal. I don't know why you would want to do that anyway. The upside is considerable savings on the cost, about 1/2. They will be 3D made. The prototypes look super. Why are we doing this? Simple, we can offer for about half the price of the aluminum adapters using the same mags. We are also looking at making a "gizmo" to sell so you can modify your own mags. They will have the same dimensions as the metal, just not metal. This is early info, any interest guys?