ZoeTze Posted February 24, 2009 Report Share Posted February 24, 2009 N.P.A.S means Negative Pressure Adjuster Systm You can buy the kit to install stock nozzel becaome to N.P.A.S. For WA 、INO、G&P series M4 follow is link for test vedio Link to post Share on other sites
Horsem4n Posted February 24, 2009 Report Share Posted February 24, 2009 hay, its been done. http://www.arniesairsoft.co.uk/forums/inde...howtopic=162405 Link to post Share on other sites
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