AirsoftRegan Posted January 23, 2021 Share Posted January 23, 2021 Hi guys so I’m looking to get an MP9 an potetionally a drum mag with a hpa conversion however I’m fairly new to HPA. How do I know which tank/ regulator an line to get and what psi to use. Might sound like a stupid question but you gotta start somewhere Link to comment Share on other sites More sharing options...
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