Driggy, that's excellent advice, except that I made a search and found that Tikka still has one importer in the USA in Oregon. I called the number (503)-263-3787 at 7:30 am Pacific time and a man with a thick New York accent picked up immediately. Guess what?
1. They will sell you a brand new Tikka 512SC for $1,350.
2. Choke tubes are $22
3. Ejectors are $40 each.
The man frankly discussed the ejector problem and recommended that you cut two coils off each ejector spring to remedy it. He said the problem is caused by the retainer breaking and the ejector not staying in.
Tikka O/U's are still available in the USA by Marocchi and this guy is the sole US importer:
http://www.marocchiarms.com/index.php?c ... he=0&page=
Marocchi may have quit making them, too. The products page of Marocchi doesn't list the 512SC, but they are still making over and under shotguns of other designs.
I don't own an Italian 412, but I do own an old Savage 333 and a gorgeous Valmet 412S made in Finland. I've never had the slightest trouble from either gun, and I've long considered that a least teh Finnish made 412's were the very best of the middle priced over and unders, ranked in this order:
SKB, RRL, Citori, Beretta 686, Japanese 101, and Valmet 412S
I at least one of all six of those, and consider any quality differences between them to be minor. However, the SKB and now the RRL are no longer being made, but are still available and the RRL apparently enjoys the typical Ruger "we'll fix anything that's our fault for free but we don't have a written warranty so you don't sue us or get any crazy ideas" warranty. The 101's haven't been made in about 25 years, and the new gun being made now in Belgium just shares the name. I don't own one yet, and therefore can't recommend one.
But there is exactly one importer as of today for the Tikka 512SC and he has parts. It's worth calling him to hear the New York accent. I'm sure he thought I had a thick Ozark accent myself, and he'd be right about that. We didn't need interpreters, though. He was very polite and knowledgable about Tikkas, and virtually every part on the Tikka is the same as the Valmet.