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Compatible with all Marui compatible M4 series Airsoft AEG. The Ultimate Hopup Unit designed by Madbull

Parts and Materials:
Metal body, includes a famous MadBull blue bucking (60 degree)
Tracer unit is optional.

The first mass production LED module for Hopup.
You can change your Hopup chamber to be a tracer unit easily. (A MadBull Ultimate Hopup needed.)

The Madbull Standard Cylinder Set has all the necessary parts to upgrade or replace the cylinder assembly in your gearbox. The Cylinder Set includes a cylinder head, air seal nozzle, Madbull Alien green PX piston, the cylinder, and a polycarbonate mushroom piston head w/ bearings. The Cylinder set is compatible with most major brands of AEG. Take your standard gearbox to the next level of performance with the Madbull upgraded cylinder set. It is a must have for a high quality build.

After 6 months try and error, we finally made the most "colorful" spring which is more beautiful than anyone else. (So does the performance)
(The color is not painted. It is hard-coated by special process.)
Calculated carefully by computer and test by 100000 times punching.
Our spring has been proofed that the length and force are still consistent.

60 degree rubber is softer than normal 80-90 degree rubber.
It is much easy to install and operate the softer rubber bucking.
The B.B. will shoot out easy without headache and need less skills to upgrade
Cons: This item may last shorter than the regular rubber.