Laser metal sintering will allow anyone--without CAD/machining skills, or access to a machine tools---to create any weapon they choose. Still too costly for home use, but the price should fall dramatically over time, as it has with other technologies.
"Here we are, almost one year later, and Eric Mutchler, Project Engineer at Solid Concepts, who was the developer of the first 1911 pistol, has produced a new 1911, this time a bit fancier. Although the gun likely will not appeal to everyone, the detail and lettering on the firearm show just how incredibly accurate the direct metal laser sintering machine used to create it must have been. Using a high powered laser to directly melt metal powder, layer-by-layer, this weapon was produced."
https://3dprint.com/21109/3d-print-metal-gun-reason/
"Here we are, almost one year later, and Eric Mutchler, Project Engineer at Solid Concepts, who was the developer of the first 1911 pistol, has produced a new 1911, this time a bit fancier. Although the gun likely will not appeal to everyone, the detail and lettering on the firearm show just how incredibly accurate the direct metal laser sintering machine used to create it must have been. Using a high powered laser to directly melt metal powder, layer-by-layer, this weapon was produced."
https://3dprint.com/21109/3d-print-metal-gun-reason/