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Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG
by Steven M. Date Added: January 16, 2013
Finally a review from my usage of it....This hop up unit is Amazing. Seals very tightly against the gearbox and the wheel Does Not Move!

Only con i can think of was that the blue bucking that Comes with it is a Very tight fit in the unit.....I'd use something else unless you want to use brute force to get your barrel out lol

No need to readjust wheel
Tight seal against gearbox

Bucking it comes with is almost too tight of a fit

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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