let me guess it burnt out? happened to me, you can find an ICS replacement switch on WGC but it looks like its sold out right now. if the systema switch is the same as the stock TM switch it wont fit right , I tried swaping in one only to find the ICS one has something different so all I did was swap the contact points and wires from one to the other, try to find someone who is selling off butcher parts from a mechbox and try that rout could save you some money.
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