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Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG

ID: 32281 (Hopup-MB-Ultimate)
4.1 stars, based on 11 reviews
Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG
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$30.00 $24.60

MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.

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.


(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 bb??s with a magazine change. This new design provides you with a way to keep bb??s 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.

CAUTION: This hop up unit is designed for the experienced and responsible Airsoft player. With the magazine removed the AEG is still able to fire several BBs. Always wear safety goggles and treat all Airsoft weapons as if they were loaded.

(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.
Note: This product will work with plastic body AEGs however some modification is required. Professional installation is highly recommended.

11 Customer Reviews

(Write a review)

by Eric S. on 09/22/2015

Cheap look/feel
Metal is rough and unfinished
Horrible tolerancing will lead to problems

I got one of these with a Madbull Metal body. Seeing as I was going to buy the prowin hop up the next order I made I was happy to not have to anymore. Wrong. This hop up is so badly made that I had to sand it to fit into a body produced by the same company. The metal is just unfinished. you will have problems because it's not the correct dimensions out of the box. Unacceptable for an "ultimate" hop up chamber.
by Debra L. on 03/31/2014
"This is buy far one of the best hopup chambers on the market. However it can be a pain to install. I have it and so do two of my friends. When i got it it took a lot of tries to get it in perfect because it has such tight tolerances but once i got it installed right it worked like a charm. However both of my friends had to file a few millimeters off the front of theirs to get it to work with out jamming. But after getting it working it will hit a man size target 3 out of 5 times at 70 yds laser measured with a stock M4. Over all i think this is the best hopup on the market and would highly recommend it.
by zac m. on 02/02/2014
"i got this hop up a few weeks ago and have played with it at an all day event. first, those who are having issues, put any other bucking in it. it will make it a thousand times better. i just ordered myself a REAPS bucking because I've heard nothing but good things about them so i figured i would give them a shot. the only issue was that the adjustment on it is quite firm(which is actually a good thing i was just playing on a cold day so as the gun got inaccurate then i would get inside and it would warm up. anyway. i belive his would work in a scar, although it is about 1/4 inch shorter than my scar hop up. thanks al, and please write reviews so you can get a better idea on whats good and bad

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