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Take a GBB pistol...look at the slide...that's basically the "open bolt" system.
Take a look at the parts/pics of the "closed bolt"/brass tube system...not really any more parts between one and the other...but set up differently.
Both work. There's probably a bit more places/points to look at for fit and wear and tear (orings) on the closed bolt design. But on the upside it's more of a contained system so if it's lined up and working right, it'll work for a long time.
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