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I had this happen on a G&P once. The disk inside the gun that the selector lever rotates actually partly stripped. It would turn backwards (towards safe) no problem but going from semi to auto had just enough more tension to cause the disk to stay at semi even though the selector moved. It felt the same as normal so I never suspected the selector.
It could also be that the selector plate is not interacting with the cut off lever properly. Are the cut off lever, selector plate, and mechbox all from the same brand?
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