AirsoftNT in Hungary shows how to change the hop-up rubber of the Double Eagle M904... "I made a video about a basic development for any airsoft replica - changing the hop-up rubber. A green G&G rubber will be inserted into the Double Eagle M904 purchased earlier, there will be a chrono and test with different BBs.

IMPORTANT: This video is specifically for the Double Eagle M904 series, but the procedure is completely similar for most AR15/M4 platforms."

Pheas Airsoft checks tthe compatibility of the Warhead Brushless Motors with the Double Eagle M904 AEG... "This is another requested video, again for L'Arnold who wanted to know if the Warhead Brushless motors would fit in the Double Eagle Series.

Come check it out to find out. If there is a particular video I can help you out with then let me know!"