To quote
"drache sent it to me, received it this morning and I just finished fixing it.
Seems like the stock G&P hop up unit was made in the dumpster, unstable, flimsy gears, and it had a larger than average boresize for the barrel to fit inside. This caused movement inside the hop up unit and there was unwanted amount of inner barrel movement, the C clip also didnt help, it actually didnt even hold the barrel in place.
It was also missing the spring that contacts the body to the hop up unit."
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