In the book they mention that Shugart was packing an M-14 and that the rest of the operators made fun of him for using an "antique". Later it became apparent to some of them that he was probably one of the smarter guys because his weapon had greater stopping power compared to the 5.56 ammo everyone else was using. So it probably was an M14 unless the guys had just reffered to it as such by accident.
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