The easiest way to lock full auto out would be through the selector plate was modded or it was removed completely... safety on all guns is a mechanical safety on the gearbox itself, it won't allow the trigger mechanism to be moved, so it's not part of the auto/semi portion of the selector plate.
Separating the lower receiver out of the upper should be able to reveal the top of the plate... better idea to watch a youtube vid to see what else is involved in taking the gearbox out completely.. then reverse the process to reassemble and readjust motor height.
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