Firearm work spans turned parts (barrels, pins) and prismatic parts (receivers, slides). Receivers and slides are ideal 3/4-axis VMC work — aluminum or steel, features on multiple faces; barrels are turned and deep-hole drilled/rifled on lathes or dedicated equipment. A versatile VMC plus a turning center covers most of a shop's needs.
Match the machine to the part: VMC for receivers, lathe for barrels. Value both at The Machine Blue Book. (Follow all applicable laws and licensing for firearm manufacture.)
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