[KrashRider]

I use a modify gear box and nozzle with a madbull body. I had issues with airseal using the madbull hopup chamber. Even using the madbull barrel only slightly improved things. The madbull ultimate it just doesn't play nice with none madbull parts. I tried every bucking as well and only one that worked well in my setup was the madbull blue. I had to eventually modify the barrel end of the chamber since I use a prome barrel to get the inner barrel to sit well with the bucking.

It becomes a trial and error to find what works and even then maybe you will have to modify parts to get them to mate up better. I gave up on the madbull ultimate eventually and went with another hopup chamber. Contact airsoftparts they might know of a chamber that is known to work better in that body and internals.