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I am using a prime hop up unit for AEG + Prometheus hopup rubber( purple)+PDI inner barrel for m733, it works great. Accuracy level is close to an AEG when on semi, when turns to full auto, all gbbr are the same, you can only expect the bb hits somebody by luck. you need to spray some silicone oil on the rubber and inside of the hop up chamber when you squeez the inner barrel in. it's pretty tight inside. hope this will help.
Tank
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