From what I've held in my hands, all you might need is the Form 1 itself, some means of engraving the serial number, and a carefully operated drill press. Want to get fancy and use slant baffles, well then a mill would do that. Ditto for adding strategically located venting. Putting the through hole in the already spotted internal piece would be better done on a lathe, but in no way would it be necessary.
None of what I've seen would be suitable for centerfire rifle, and I would be very careful if using with a high volume of 9mm or bigger. All components were aluminum, and the assembly was screw-together. While finish was actually very good, clearances were very much on the large size.
