Another helpful video from Special Weapons and Plastic (SWAP) with this episode about the disassembly of the Trigger Group of the ARs from WE Airsoft... "Please note that I’m performing these disassemblies at my own risk. Modifications may be required for fitting. These disassemblies can go very wrong if you lack the skills, tools and knowledge required, and can damage your equipment and parts as well as cause injury on your person if you attempt them yourself."

Read more here.