i don't know about a machinist milling it, don't know if Empire/Kee/Simon are willing to release the CAD drawings of the gun just yet, but that's up to him, of course. find a decent priced machine, look for the names and the off brand at the right price and get it and practice. ask other machinists(Tinker's Guild is good for this, or other machinists forums) on what to look for what to get and where to get it. or go take a course or two at a college that offers machining courses. as much as you can learn from a book or read off the net, its a hands on thing, if you are wanting to do it yourself.