Oh did not read the vs madbull hopup.
Ok my knowledge on the madbull.
You can only use madbull buckings. You might be able to squeeze some others in but that is a if. Personally madbull buckings aren`t that bad actually pretty good if you ask me.
The madbull chamber. (I`m going to abbreviate it mc.) has a bunch of orings.
If I am right. 1 on the feeding nozzle. 2 on the side nearest the gearbox and maybe one near the front.
This hop up chamber will increase your fps.
It has like a g36 turning wheel.
Also it comes out of box with the madbull blue bucking.
It is good as it will not turn itself.
You can add a tracer unit to it which is a pretty cool feature.
Should be able to use standard nubs. Like scs.
Personally I would say get this. The prommy might be good but look at the price.
Buy off of hobbytron.
http://www.hobbytron.com/MadBullAirsoftUltimate3In1HopUpChamber.html
It is pretty cheap and hobbytron is a 10 min drive from me.