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Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG
by Andrew C. Date Added: December 23, 2011
I did a lot of research on hopups, most of the reviews for this thing were 5 out of 5, so I decided to try it out for myself. It came with very detailed directions and was easy to put together except for the bucking that came with it. The bucking that comes with it was too long so I had to cut about 1/8” off the front of the bucking to get it to fit properly. I didn’t have to make any mods to the gun to install the hopup. It takes a about a hundred or so BB’s to get it broken in. Once I got this dialed in, it worked perfectly. With the stock hopup and a madbull 120 spring, I was shooting at about 350 FPS, with the new madbull hopup it was shooting around 420 FPS +- about 3 FPS. It was very consistent and you could defiantly tell by the sound there was no air leaks. I have put about 7000 rounds through it so far without any jams or miss-feeds and have not had to make a single adjustment to it. If you have the money, I would defiantly recommend this and I’ll be buying another one for my next build.

Madbull Stag Arms metal body with a classic Army reinforced gearbox – fit perfectly without any mods

Airtight seal
Does not need to be adjusted once its broken in
Option to install the tracer unit
Solid construction
Easy to put together
dropped right in without any mods to the gun

Bucking needs to be cut down approx. 1/8”
It doesn’t always hold the bb’s after the mag is removed.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
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