These are the best MG42, MG53 rear receiver repair sections on the market today. Build a dummy gun, semi auto, or a post sample if you have an FFL 07/SOT. These are approved by the BATFE as non-receivers until they are welded together. All NFA and BATFE rules apply. You are responsible for knowing your local, state, and federal laws. Not for sale to anyone under 21 years old. No FFL required to order these. You are buying one set (Left & Right) only.