The main difference is the adjustment screw positioning. In BLEED OFF mode the adjustment screw is not exposed to high pressure gases, heat and carbon fouling giving your gas block a long service life. Running in restrictive mode may eventually erode and/or seize the gas adjustment screw from operating effectively.
Using the right amount of gas pressure in BLEED OFF mode has many benefits:
> Proper cycling of the bolt carrier group.
> Less felt recoil allowing for faster follow up shots.
> Less heat and carbon fouling, keeping your system cooler and cleaner.
> Minimize wear on the internal components.
> Adjustment screw is not exposed to high heat, pressure and fouling.
Although you can use your gas block in restrictive mode, we always recommend using the bleed off mode to experience the benefits listed above. If you plan on shooting in restrictive mode, we highly recommend backing the gas adjustment screw out counterclockwise until it stops and apply a dab of anti-seize to the gas adjustment screw before going into restrictive mode.