That broken piece of plastic is "supposed" to keep everything aligned inside the hopup chamber. I personally have owned this gun, the stock hop up is crap and I would recommend replacing it with the PDI unit for best results. The PDI unit has two pivot arms that apply pressure on the hopup bucking allowing very fine tuning of pressure that is applied to it. The end result one very straight shooting L96. Also the PDI hopup chamber requires the use of standard AEG barrels and buckings which allows for greater options for tuning you're hopup. I have owned this gun with the aforementioned PDI hopup chamber, Prometheus TB and soft bucking (plus many other mods) and it was a laser beam  . Hope this helps.
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All right, they're on our left, they're on our right, they're in front of us, they're behind us... they can't get away this time!
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Born to fight, trained to kill, ready to die, but never will.
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