Hello Walt,
Hopefully this wont apply in this case, but before you disassemble the fore end, look closely at the fore end lug connection to the barrels. I've resoldered a few that have become loose and caused the same symptoms that you report. The lug will probably not even appear loose, and the barrels will still ring, but the solder may have failed allowing the lug to rotate slightly. The typical indication of the condition will have the lug appearing solid with no solder visible on the muzzle end of the lug, with a visible linear transition to shiny solder seen at the receiver end of the lug, where the rear end of the lug has lifted slightly.
John
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