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You want to get some RED loctite. Then place a small amount in the threads of the adapter and the gas piston. Screw the adapter into the bolt carrier and make it HAND tight. Then screw the past piston into the adapter, also making it hand tight.
The loctite will do the rest. In this case I agree with Samoon, the parts most likely became loose when firing and that means overall they got longer, which means they were no longer within operating tolerances and the parts snapped due to stress they were not designed for. Even an expansion of 2-3mm due to parts loosening on their threads could have caused this.
Why GHK does not loctite these parts from the factory is beyond me, it's one of the first things every new GHK owner should do.
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