If you send a complete upper which needs to be disassembled, you need to select this service. if you just want a complete upper disassembled, and not reassembled, this is the service you need. We disassembly the upper into major components. As standard, we do not disassemble the port door, forward assist, gas block, and front sight post. If you want everything disassembled, not as such in your order. We will NOT attempt to install or remove any Chinese parts.