Comments by "" (@neutronalchemist3241) on "Forgotten Weapons"
channel.
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This is a visit to the Pietta factory. https://www.youtube.com/watch?v=qdnbNJKJ9ZE
As you can see, they use the same tooling to make their repro revolvers and their modern line of semiauto rifles and shotguns. They work in batches. "today revolvers, tomorrow semiauto rifles".
It's obvious that those machines can make anything in between. A Fyodorov Avtomat like a M1 Carbine. They only need the right imput. They can make them BETTER actually. With more consistent tolerances than the originals EVER had.
So why they don't do it?
Because, while manufacturing is not really a problem, designing is. Manual repeaters (revolvers, lever actions...) solve a lot of problems, because timing is decided and force is applied by the shooter. In a semiauto/auto weapon there are a lot of bits that have to work togheter for the weapon to work.
Much of those old designs required handfitting, because the admitted tolerances were so that, in a batch of supposedly identical parts, the right ones had to be chosen and coupled for the weapon to work. Worse, there was the "cascade matching" problem. When you took, IE, three parts that matched toghether, because they were all at one end of the tolerance scale, and then there was no fourth part that matched with them, because it should have been beyond the scale. It was a so common issue that, for the Winchester .224 prototype (the competitor of the AR15 in the CONARC competition) Winchester explicitly stated that they designed their rifle so that it couldn't happen. And we were in the late '50s. It was still a severe problem for the M60 MG.
Modern CNC machines can't work like that. so the modern designer has to come out with his own completely different, set of admitted tolerances.
Not to say that steel of the original composition is often unobtanium.
The REAL problem is that most of those designs were not that great to begin with. Even the most successful ones, (IE, the M1 Carbine, just to say one) were good FOR THEIR TIME.
But the eventual purchaser of a modern repro would expect form it MODERN reliability and durability, otherwise "This is shit! The manufcturer scammed me!". It doesn't exist "it seldomly work because the originals were like that too".
For the designer of the repro, it's like a nightmare. To him is like designing a completely new weapon, with the adjunctive constraint that he can't choose the solutions he KNOWS will work flawlessly. He has to keep it consistent with original solutions that he know work "so-so".
That's why modern repros, even when existing, mostly dont' have part interchangeability with the originals.
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@eloiseharbeson2483 The Western Cartridge ammos were not "specially loaded". They had been made to original Italian specs even in bullet construction. They only used modern propellants, because Western Cartridge, obviously, didn't have access to the original Solenite.
The 6.5 Italian Carcano cartridge has much in common with modern 6.5 and not only 6.5. Being the first one to be adopted, it influenced many of them, both dimensionally and power-wise. IE back in the days when surplus Carcano cartridges were common, and 7.62X39 were unobtanium in the west, 7.62X39 were obtained by shortening and necking Carcano cartridges. The .264 USA of the US Army Marksmanship Unit still uses a shortened Carcano case. You can't put a 162gr round in a Grendel case, otherwise the muzzle velocity would have been practically identical to a 6.5 Carcano, and infact PPU 123 grains Carcano rounds achieve 2690 fps from a 21" barrel, that's even more than a Grendel does. The .264 USA, with 123gr bullet, produces 2,657 fps from 16.5" barrel. Still not that different.
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