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I'm thinking you could 3D print one about 1% larger (allow for shrinkage in casting), and then send it as a pattern to be casted. Casting can then be fitted and hardened.
I suggested to the college that they add 3D printing for jigs (revolver frame for action wrenches) and parts as an elective for the gunsmithing program (for making parts as described above). They were not receptive.
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