Hi, Willie,
You are correct in that the "wisdom" was that any FA part in an AR-15 was illegal. BATFE contributed to that idea by circulating a poster that was displayed in many gun shops seeming to say that those parts were illegal or if any one was installed in a rifle, the gun would be illegal. But careful reading showed that they used some vary careful wording to imply, but not actually state, that idea.
Jim
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