Safe not working on ICS M4

[Death March]

Just a quicky here,I just noticed my Safe selection is not working on the Selector switch? Everything else works fine! The switch is one of the few last original parts on the gun (It's two years old and lot's of rnd.'s ).I'm trying too figure out if it's the Electrical switch or the Selctor part thats failed?The gun fires fine though?

[JohnnyDo]

it's probably the safety lever inside the mechbox. When you select safe via the selector switch, the selector plate pushes a lever connected to another lever inside the mechbox that intersects the trigger thus locking it. This action causes the trigger to not move while in save mode.