Those who are waiting for the Hop-Up unit, MadBull Airsoft sent in news yesterday that it will be released by the end of November. Meanwhile they sent in test results between the Madbull Blue Bucking and their new one, plus how to use the LED tracer unit using AEG battery... "Gents, Based on the US distributor’s test, our Hopup chamber unit have great performance and air seal.

Tested on ECHO1 M4:      Average    High     Low

stock echo barrel               297.34     303.5   289.5
stock blue bucking
(MadBull Blue Bucking)                                                  
stock hupup                                                                          

stock echo barrel              312.55     317.3   308.4
NEW MB bucking
(in package)                                                                     
NEW MB HU                                                                        

After add on the LED module, you can use your AEG’s battery (split cable included) to make your Hopup chamber become a tracer unit!

Please check gif animation attached.

MadBull"