Ok, well electronics and wiring are a bit different than gears and what not but alot of the thinking involved is the same. Was the semi-auto working before or did it not shoot semi at all when you bought it. Did it slowly phase into not shooting semi? IE, did it ever randomly shoot full auto in semi? The reason I ask is that the rifle is 2 years old. This means that the mechbox switch assembly maybe worn out where it interacts with the cut-off lever and as a result the cut-off lever is not able to open the switch and stop electricity from going to the motor. (ICS switch assemblies use very soft plastic compared to the other companies) Either way the fix will be in exspensive.
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