exile,
Welcome to the sometimes confusing world of NFA weapons.
The thing to remember is the cut off date for civilian owned machine guns is 5/19/86. Machine guns registered prior to that date (including DIAS and LLs) are legal for civilians to own (with some exceptions).
The text for the Glock link above says "The FIRE SELECTOR SYSTEM for Glock Pistols is a state of the art product developed by the firearms inventor Jorge A. Leon in 1987." Too late for regular civilians to own.
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