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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Added cost and complication (reliability factor) are negative attributes. Only real pro is the ability to run a suppressor on it, which isn’t a common need. Suppressors aren’t some magical device that eliminate sound, they only reduce it. Plus it means you also need taller sights for aiming above the “can” of the suppressor.
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