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Reading about your rifle's issues, and hearing all the things you've done to find the fault, I'd suggest you look further back for the cause of the problem - particularly in the trigger group.
My expertise is with WE's M4/16 chassis, so I have to make some guesses about how their L85s function, but my first guess would be that the hammer is getting hung-up, not fully retracting, and putting the brakes on the bolt's rearward movement. Take a look at that and see if there's a solution back there.
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* * * * * * * * * Rob Bye
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