You can print the lower receiver and the rest of the plastic parts. I wouldnt print an upper receiver, too much stress and too much heat... plastic doesnt like either one. I wouldnt even trust a lower receiver to be honest with you, but I have seen them molded from polymers but even those arent very popular.
I've been 3d printing for almost 4 years and I have 6 printers here at my house, and I would still consider a printed gun to be a one shot survival type tool.
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