If that passes, continue by moving the selector lever to the Semi position, then move the selector between detents (such as Semi and Auto) and pull the trigger.
* Misalignment of safe detent position on firing selector will cause a malfunction that may accidentally arm the mortar and can result in unintentional discharge of round.
The lever will be retained later by a spring-loaded detent. The lever must be installed now because on some (but not all) AR receivers, there isn't enough clearance to install the safety after the hammer is installed.
It has a thumb-operated lever that unlocks a detent to allow the fuel tank, carburetor and handle to rotate 360 degrees, but will lock into 90-degree detents for cutting so the fuel tank always gravity-feeds the carburetor no matter what angle the saw is cutting.