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Hop up does have the spring in front, this is the hop up which originally came with the gun. Rubber is good and nozzle looks practically new.
I have tested the Hopup, rubber and barrel assembly on a different gun and it works perfectly yielding the exact same FPS as the assembly the gun normally is with.
One thing I have noticed the nozzle is it seems to be just a smidge longer then my other M4, as when I press the barrel assembly up against the gearbox and drop a BB in, it wont feed the BB.
I have to push the hopup forward a hair bit before it will drop in place.
I only noticed this issue now after acquiring new mags, and have attempted to test FPS for selling purpose.
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