You need a parts kit, receiver (100%, 80% or a flat) and US parts to satisfy section 922r (?) to have a certain number of parts in the rifle US made, and tools. I'm hoping to get a group of people together so we have all the tools. They'd include a press, flat bending jig, spot welder, go & no-go gauges, grinder, punches, bf-hammer, vise & a few more. There's a ton of info on AFCOM under the AK47 Build-it-Yourself forum. If you get the kit, receiver flat, fire control group, muzzle break and gas tube, then you'd have enough parts for a legal build. If we can get the people with the tools here, you can make an awesome AK47 for $200 or so.