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

ID: 32281 (Hopup-MB-Ultimate)
Madbull859188322813MB ULTIMATE HU32281
3.7 stars, based on 18 reviews
Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG
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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.

About Madbull

MAD BULL Airsoft, established in 2004, is world famous for it's Airsoft accessories. Our major focus points are: Airsoft guns, Airsoft Toy Launchers, Airsoft Toy B.B. Showers, and Upgrade kits.We have a very strong R&D team and we put a lot of effort in designing new and exciting new products for the airsoft community.

18 Customer Reviews

(Write a review)

by Christian B. on 06/12/2017
"If it helps a prospective buyer, I upgraded my Valken battle machine v2 with this hopup and it fit and functioned perfectly without any modifications to the receiver. So far it looks like a night and day difference from the stock one, I'm happy with this hopup!
by Robert V. on 04/04/2017
"I have owned this hop up unit for about a year and a half now and I've got to say it is by far one of the best hop up units I own. I own 2 prowin hop up units as well and I will say that functionality is just as good if not better than the prowin. This hop up can take a wide variety of buckings where as I know the prowin prefers thicker buckings. This hop up is very accurate and super easy to put together and install. I would highly recommend this hop up unit as a replacement for any stock unit that way one can get the best accuracy out of ones gun. The set up I use for my custom built p* jack is this hop up with a modify soft type bucking and an angel custom h-hop nub. I get very accurate and tight groups ~150 feet with .25s and my madbull 300mm 6.03.
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.

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