The G3 is a great build. It was my first home build. It shoots great and mags are only a few bucks each. There is very little work to build the G3. Just a little bit of welding on thin sheet metal. If you can't weld thin sheet metal you should get someone who can weld to help you. The best receiver hands down is the JLD receiver that POF sells. They are out of stock right now, but I would buy the parts kit now and wait for the receiver to be available again soon.