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.

Features:

• (1) The LED Tracer Unit: You can buy it separately and attached to the Hopup unit. Use your AEG battery and connect to your Tracer Unit. The LED can brighten the tracer BB when BBs are in the chamber.

• (2) Chamber Lock: Designed by Brian Holt. With this new hop up design you will not have to worry about losing and dropping several bbs with a magazine change. This new design provides you with a way to keep bbs in your AEG and ready to use and not on the floor and even better it stabilizes the top of the magazine to ensure a secure and flawless feed of bb??s into the AEG.

• (3) Easy Adjustment Wheel device: Use TM G36 style adjustment device and apply on the M4/AR unit.

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.