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.
Full Metal Housing for maximum durability.
Hopup rubber packing included. Fits all M4 hopup rubbers.
Adjustable hopup dial.
Fits all metal bodies. (Exclude KWA metal body).
Compatibility: Matrix, Dboy, Echo1, JG, Classic Army, G&P, SRC, AGM, Tokyo Marui, VFC and other m4 / M16 series Airsoft AEG.