First pic shows how little rotation of the "compensating screw" it took to put these Lefever barrels back on the face. Barrels were .003" off as measured with a steel feeler gauge. That black mark on the knuckle shows the center of the screw slot before turning it to tightening the barrels. GREAT DESIGN by Uncle Dan! So much easier than getting into a rejointing. Yeah I know .003" isn't that much and I've seen gents shooting double guns with way more than that, but for me the barrels are on the face or they I'll get them there.
Second one shows the tubes on a really nice 1908 Lefever G Grade. Kind of a neat story. The gun was found by a plumber doing work in a home. He made an offer and left with the old unsafe Damascus gun.

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Can anyone please identify this pattern?