Position #1 (U) (No Venting) Unsuppressed with standard ammunition
Position #2 (first dot) Unsuppressed with heavy military ammunition
Position #3 (second dot) Suppressed with low back pressure suppressor or light commercial ammunition
Position #4 (Full Vent) High back pressure suppressor
Every rifle and configuration will have different dynamics. The Bootleg Adjustable Carrier gives the user maximum control to adjust the venting in a way that gives them function and control. A heavily gassed rifle may function on all four setting unsuppressed, but pressure is still being relieved to reduce carrier speed. Having the carrier set to the incorrect setting with your carrier group configuration will induce malfunction, so take the time to find the right setting for your rifle setup.