My go-to grouse gun, model 17, is 5lbs 14oz but it's not all original as it has a polychoke (25" total barrel length) and the grip was fasioned to a semipistol/POW and the stock extended (had been cut for a kid) and hollowed out. I would think most from the factory were 5 3/4-6 1/2 with the heavier guns being ones with 30" solid rib barrels or dense walnut.

The downside with the Ithaca Ultrafeatherlights was the aluminum trigger gaurd, which with heavy use developed some issues to my understanding. Latter Ultrafeatherlights used steel trigger units and were a little heavier. (based on my sometimes faulty memory)

"Not all who wander are Lost"
-Hoppie 14'