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There technically isn't the same concern with "barrel suck" and porting that you'd have with a fixed volume pneumatic system like with AEG's or spring cock guns. With gas guns, you could generally install any length inner barrel you want, and the system will sort itself out. It will shut off the gas when appropriate. Thus, you could put in a 2 mile long inner barrel if you wanted.... although the gas in your mag might deplete before the BB leaves the barrel. LOL
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