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While 100% is currently impractical, you can actually print 95% of a gun for 22lr. You need a nail for a fireing pin a barrel insert, and spings you can get from a nerf gun. That said, you could use the same to convert a nerf gun.
I’m also not talking about the single shot proto gun you’ve seen, I’m talking about a scaled model of a 1911. Guns are so fucking simple and regulation is like trying to prevent lock picking.
No, you cannot have a firing chamber made of plastic, unless you use engineering grade plastics, in which case, it’s cheaper to just buy a gun, not like they are expensive or difficult to get.
You just bore out the barrel insert to receive the casing then reinforce it with 100% infill in petg or nylon. It’s not a perfect solution but my experiments last about 100 rounds before things get loose. I’m eyeballing injecting epoxy into low infill models next.