Rob....I bought an Ithaca NID 12 gauge a few months ago. Gun was in excellent condition. Barrels rang like a bell. Lot's of case. Bluing about 90%. Earlier one with cocking indicators. My oldest son fell in love with it, and used it for trap shooting at the local club........Probably shot 36 rounds of trap with it, using new Federal Gold Medal Papers. (2 3/4 dram 1 1/8 ounce shot)Cleaning it one evening, we noticed the right barrel separating from the top and bottom rib for a distance of 16 inches. (By the way, hanging the barrels from a string around my finger, they still rang like a bell, so they might have been coming apart before I bought it.)
Anyway, they are on the way to Kirk Merrington for relaying the ribs, at 500 bucks...... And that does not include the reblueing, which I am going to do myself.
How strong?? I don't know........But I'd watch the barrel-rib joint......And maybe check the stock head for cracks....Grant.