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Some aftermarket barrels have smaller gas holes than others so effectively all ready do this-I have a true flight barrel that has a tiny hole so doesn't really need an adjustable block. The cheeper the gun the more likely it is to have a large hole to make it more reliable-these old guns that no one ever thought were going to get suppressed are why everyone now thinks they need an adjustable block if they are fitting a can.
I have to disagree. If the gun cycles at all unsuppressed, then it's going to be overgased when suppressed.
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