I wasn't even going as far as talking about semiauto conversions. The XM177 was an X rifle. How accurately were such quasi-prototypes marked in the early days? Were they initially just built out of available M16 parts? If so, would there be any way of saying "no, this is an M16, not XM177 receiver"? In the mid-sixties there might not have been as much concern with markings.
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