When I was a student in Germany in 1970, I ordered a Krieghoff Teck O/U double rifle with interchangeable barrel sets in .458 Winchester Magnum, .375 H&H Magnum and 20 gauge 3" magnum. The Teck was made only on a 16 gauge frame at the time, hence 12 gauge was not an option. I later ordered a 12 gauge Teck, when it became available, with interchangeable barrels in what I christened the .450 C&W Magnum, essentially a rimmed .450 Watts. The first set accompanied me on all my trips to Africa and proved itself time and time again, taking elephant, buffalo, lion, leopard, eland, and greater kudu.

The Teck action is a very strongly constructed box lock with "Kersten" double locking lugs on the sides of the upper barrel and a double under lug construction. I have since had a set of .500 NE barrels made for another 12 gauge gun. All my O/U double rifles are fitted with low power scopes.

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A Krieghoff Teck O/U 12 gauge identical to mine is on sale at the German auction site eGun. So far there have been no bids and the price is quite reasonable. https://www.egun.de/market/item.php?id=12634635

Another Krieghoff Teck, this one a double rifle in .30-'06, is for sale on Guns International for considerably more, but the illustrations clearly show the features of the action contributing to its strength: The Kersten bolts and the double under lugs. https://www.gunbroker.com/item/882210859