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Well, at under 400 fps, I think a Systema shell wouldn't be likely to break and would probably last the for many years, possibly even the lifetime of the gun, just as the Pro Win would. I don't disagree that the Pro Win could take more a lot more sustained abuse with a stiffer spring than the Systema though. I'm talking more in terms of practicality with his targeted velocitiy. They'd effectively be as durable.
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