Hmm, I'm having a tough time imagining the selector plate binding because the selector switch moves freely and with uniform pressure between each position. Maybe the back end of the plate is flexing out so that I can't feel the front end being hung up on the cut off lever...
I'll take a closer look next time I have my hands on the gun - will do some testing with just the mechbox and grip/motor outside of the receiver so that I can see the cutoff and entire selector plate while it cycles.
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