Talking used guns, a comparable 12 will generally cost less than a 20. The latter are more sought after by bird hunters, and there are usually more used 12's available. The Ithaca SKB imports included a variety of choices for buyers: Pistol grip or straight grip. Ejectors or extractors. Beavertail forend or splinter. 26" or 28" barrels. Yes, the trigger is inertial. However, of all the SKB sxs I've owned--going back to the first one I bought in 1972--I haven't experienced any trigger problems. I'm more particular than some about pull weight, and I've never had to have one adjusted by a gunsmith.
Good luck getting over $2,000 out of a 12ga Ithaca SKB unless it's in close to mint condition.
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