"The 3D printable AR-15 rifle receiver allows a standard AR-15 to be modified to shoot larger, more destructive ammunition." by Scott J Grunewald · August 10, 2015

I would love to see you try and explain how this is possible. Unfortunately, you have no idea what you are talking about. A standard AR-15 receiver can be used with many different calibers of ammunition without modification, just by changing the upper receiver.

If you are trying to provide news, please limit your posts to news, not inaccurate fearmongering.