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 (FPS)
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