Working gun made with 3D printer

[SMGSterlin]

EDIT: I've just been enlightened that you still need a lower receiver you still need a metal upper receiver to contain the force of the round being fired along with a metal barrel to contain the heat and friction. So its not all totally built by the 3D machine, and you need a license for the lower receiver.

This could probably be made from carbon fiber, so you may not necessarily need metal at all.

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