This is a classic V2 mechbox failure. The front of the box fails. It makes a funny clacking sound. You bend over and listen and pull the trigger to hear what its doing - it makes more noise. The piston then overruns its typical stroke length and takes out your hopup. You continue to pull the trigger in the hopes of diagnosing the problem or hoping it will plain go away because you are in denial. You then crack your receiver which is the only thing left with integrity holding the front and back of the gun together and is taking all the remaining piston smacking.
I know, because I did this back in 2004 with my first TM M4.
Buy a re-enforced mechbox with quality internal parts or get a complete pre-built box and replace it. Replace your receiver. Don't do it again. Expensive lesson, but it is what it is.
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