Machined from heat-treated hardened steel, SHS cut-off levers are designed to replace stock zinc-alloy or pot-metal levers that round off over time. The cut-off lever is the critical internal component responsible for tripping the trigger contacts after a single gear cycle; replacing a worn lever restores crisp, reliable semi-automatic firing and cures "runaway" full-auto issues on semi-mode. The steel construction provides high wear resistance against constant sector gear cam strikes. 100% Tokyo Marui compatible.