[Flag_This]

But it’s printing a polymer, right? So would you use the plastic piece as a pattern to cast a final steel lower?

[mike_9958]

You can print with metal as well.....

[PapaBear3625]

But it’s printing a polymer, right? So would you use the plastic piece as a pattern to cast a final steel lower?

Why does the lower receiver need to be steel? It's the upper that has the barrel and bolt. What they're talking about is making a polymer lower, adding a purchased trigger group assembly and an upper, and away you go.