A little history about falling blocks but not as far back as to Buffalo hunter rifles.
After my nephew finished his 1st Iraq tour with the 4th ID in 2004, I went over to Ft Hood to visit. He gave me a tour of his tank company's hardware. In the hull of a M1 looking at the back end of the 120mm main gun, I noticed a couple of things. First, it was manufactured by Rhinemetal and secondly, it was a falling block action. A little research later taught me that the US main battle tank weapon is a linear descendent of the famously effective German WWII 88mm and still made by the same company. If you look at pictures of the breech mech of an 88, it is visually identical to a modern 120mm.
The recoil lugs are a little bigger than we're used to but a 300,000 grain "bullet" at 5,000 fps+ is a bit more muzzle energy too.
Seems to me that whenever I get the chance to see a large US Naval gun, they tend to be an "interrupted screw" lockup.
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