Loose Forend.

[B. Dudley]

Not uncommon in doubles either with ejectors.
Some of the ejector parts want to fight agaist the forend's position on the barrels. That combined with wood shrinkage can cause a little bit of a loose feel.

[paul adams]

Thanks to all that posted. The looseness was pretty much eliminated by tightening (2) screws and the addition of tape.