They've arbitrarily tossed some Service Rifle rules into that M110 Classification, that don't belong there.
* There is no front sling swivel on the M110.
* There is no carry handle on the M110.
* There is no front sight assembly on the M110.
So, they need to think those rules through, and change them to fit the "U.S. Rifle, Caliber 7.62mm series, as issued by the U.S. Armed Forces..."