Another helpful video from Fulcrum to help owners of the MP5 AEG fromn CYMA to remove/disassemble their hop-up units... "In this airsoft guide I'll be showing you how to remove the airsoft hop up unit from a CYMA MP5 AEG, this guide should work with any CYMA MP5 and also any other airsoft MP5 AEG similar in design. Once the airsoft hop unit is removed I'll be attempting to fix the loosening issue to stop it from losing hop pressure after a few shots due to the vibration. Hope this video helps!"