Many M14 stocks were put on semi-auto "clones" and the hole for the selector tang filled in with plastic wood or some similar material, sometimes with an actual wood insert, for appearances. BATFE "discouraged" making semi-auto receivers with the tang and with the configuration of the M14 right receiver rail, saying they would be too easy to convert to full auto. That is why rifles like the M1A take down like the M1, not like the M14.
Jim
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