AEG power spring, non-linear design, black coating, developing 100 Newton of force while compressed at 62 mm length.
For use in MDR-X AEG, depending on your battery type/wear and environment temperature, it might  be necessary to disable battery protection for proper operation.
 
When buying parts from Longbow BB Ltd, you confirm you have the required ability to install and tech your airsoft replica as required. Longbow BB Ltd do offer a paid for service option for us to look at your rifle and try to solve any issues you maybe having. We need to manage your expectations as we (Longbow BB Ltd) are unable to provide extensive hours of tech advice for parts purchased that have been installed by yourself. All parts are inspected before dispatch to ensure product quality.