Polarstar MRS RegulatorThis compact regulator stands just 3 inches tall and threads directly onto the HPA tank. In so doing it eliminates the need for a separate UFA and keeps your air rig profile to a minimum. What sets this regulator apart from competing models is its integral on off valve. This enables you to depressurize the system prior to unscrewing it from the tank to alleviate wear and possible damage on the tank threads and o ring. Adjustable output pressure from