I built two of them in 2001. Designed and built my own side plate, trigger and sear and did all the machine work. They are a different design philosophy and the work is more mechanically intense. The AK's I built 10 years ago were more difficult with respect to the receiver fabrication because of the flimsiness of the material and riveting. If you are interested, go to www.1919a4.com and you will get all the help you could possibly desire, plus there are a lot of folks there that make and sell at reasonable prices, everything you might need.