As I have come to understand, the feature prevents loss of gas between the chamber and barrel, and also allows the nagant to be suppressed. These both seem to be good things in my opinion, hence the question.
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It’s a added mechanism for very little advantage, the added velocity is about 50fps . Revolvers are known for a simple strong action, that requires less skill to maintain.
Moving the cylinder forward after rotation to seal with the special round adds a extra thing that can go wrong, needs to be cleaned and adds to the cost.
The 7.62×38mmR round is not a powerful round, about the same as a 32ACP, not that powerful. Using a more powerful round would most likely cause the gun to fail.
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