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Darsmark's post sounds very similar to what a friend of mine did, something like 40 years ago. He had a 12-ga. hammer double with shortened barrels (24", give or take), and a gunsmith friend of ours did the conversion. The smith was very particular about testing the metal in the receiver, made sure the double-lug locking system was tight, and milled out a slot across the breech face, silver-soldered in a piece of tool steel, and re-drilled for smaller pins; he turned the original pins down to "rifle primer" size. He mounted a three-blade "express" rear sight, and a blade front sight, both on the rib.
The smith had lucked into some Martini-Henry barrels - the ones with "Henry" rifling - still packed in greasy brown paper, and those were used to make the liners.
Now, this memory is kind of faded, but as I recall it, he was able to turn the barrels to fit them into the breech end of the shotgun. He silver-soldered them in place at the breech, keeping them centered, with a little space around them, at the muzzle. He then put in some steel shims around the liners. He started with the left barrel, I think, and test-fired it, moving it around with more shims, until he got it to hit about half-an-inch left of center, and about an inch high, at 50 feet (he was working in an indoor range). Then he soldered the shims in place, and repeated the process with the right barrel, until it hit the same distance right of center, and about as high. I don't recall how he filled in the gap between the barrels and below the rib.
The gun was test-fired with substantially overcharged loads, after all this.
The owner never fired this with any kind of high-powered loads... he shot US standard "Trapdoor" loads, or else black powder. Regrettably, he sold it some years ago.
I shot the gun quite a bit, and found it to be very muzzle-heavy, not much fun to carry in the woods. The recoil was about the same as a "Trapdoor" carbine.
_________________ Pete in NJ
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