RA Tech NPAS Kit for KJ M4 GBB Airsoft Rifle

RA Tech NPAS Kit for KJ M4 GBB Airsoft Rifle Metal Construction A Negative Pressure Adjustment System allows the user to adjust the gas flow to making the tweaking of the power as easy as turning the tool Suitable For KJ Work M4 Series Airsoft Gas Blow Back GBB Rifle Airsoft Guns