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ATF Approves 3D-Printed Polymer AR-15 Lower by Forerunner 3D Printing

Additive Manufacturing, or 3D Printing, is becoming more and more commonplace in the firearms world. From cheap home-brew solutions to advanced industrial manufacturing of silencers, AM is found across a large spectrum. Forerunner 3D Printing brings to the table a new development: legally serialized polymer 3D printed receivers.