From Polarstar Airsoft we have the Modular Regulator System (MRS).
This 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.
Features:
Adjustable output pressure from 40PSI - 145PSI (Standard Configuration)
Optional High Pressure Spring boost Max Pressure to ~200PSI
Oversized 4mm piston bore for extremely high flow and refresh rate even at 40PSI
Integral Tornament Lock can be secured with with a standard zip tie.
Compatible with standard HPA Tanks as well as SLP Tanks
HIGH PRESSURE SPRING NOT INLCUDED.
Specification:
Min Output Pressure: 40PSI
Max Output Pressure: 145PSI (~200PSI with HP Spring)
Max Input Pressure: 900PSI
US Foster Female Fitting