*shrugs* I think all my shotguns rattle to some degree if you shake them hard enough...
My Benelli Nova and Maverick 88 sure do. The Chinese knockoffs of the 870's seem to rattle the least. My Mossberg 590 is about the same, little or no rattle. My 870 with wood stocks rattles more than the ones with synthetic stocks...
If I remember right, the Remingtons have some spring tension on the action bars, where the Mossbergs do not?
Regardless, the noise from the forend rattling is less noticeable than my sling swivels rattling and FAR less noisy than actually operating the shotgun.
You can't beat a woman who shoots.