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RAG-GHK--005
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All you need to do with the RA Tech N.P.A.S. (Negative Pressure Adjuster System) flute valve before it becomes fully operational is to install it into your GHK AK GBB, a great replacement for the stock flute valve you already have installed. The NPAS system allows you to adjust your power output on the fly with a specially designed key (Included).