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The cheapest way to fix this is with coke cans. Wrap the chamber block in a sheet or a of aluminium cut from coke can, then screw the chamber block back into the receiver. If the chamber block still wobbles add another sheet to increase thickness. If it doesn't screw in fully then cut the sheet in width and try again.
That in my experience gets rid of all Marui barrel wobble until receiver tabes break, and even some misfitting one piece barrel to metal receiver wobbles.
Same with the interface between the external barrel tube and the chamber block and the front sights. A small aluminium strip wedged in gets rid of wobbles almost immediately.
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