Make a Factory Quality 9mm Rifled Barrel in your Kitchen Using Salt Water and Electricity (ECM)

Back in March 2017, I reported on a proof of concept attempt to create rifling grooves, essential to ensure stabilization of bullet, in a length of steel tubing using a process known as Electrochemical Machining (ECM). This was achieved using a simple jig designed using a 3D printer combined with copper wire laid into the ‘mirrored’ groove channels through which salt water is continuously passed through using an inexpensive electric pump and bucket set up. Essentially this process is the reverse of electroplating, instead eroding away an exposed surface, in this case, a series of shallow channels usually produced using a rifling cutting tool or by having a ‘button’ forced through. 

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-WiscoDave