3D printing, which IMO is a promising path to a precise Luger replica in the foreseeable future, continues to advance. GE is planning to make an aircraft engine with 3D.
http://www.3ders.org/articles/201607...ine-by-ge.html
The links at the bottom of the above story also are interesting; for example, classic car parts now being made via 3D assist. They use 3D to make the molds for the castings, machining on the metal casting is still required. The central problem remains: a Luger replica would be a relatively short run, so unless a lot of the 3D and machining set-up labor is donated, Luger replicas - while clearly possible - would be expensive.