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"Something clamped on the bolt carrier"
I have the "AR-15 to M-16 Conversion Book", and what you describe sounds like an adapter that is fitted to an AR-15 bolt carrier, to make it function like an M-16 bolt carrier (for tripping the auto sear).
Follow the advice of others: Thoroughly inspect your AR for M-16 parts, and get rid of any you find. While the "clamp" is not an M-16 part, it probably falls into that gray area, since it's used to convert to full auto.
LL
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