Nope.
This is Mawhinney's rifle on display in the USMC museum.
When Ed Land founded the modern USMC Scout-Sniper school in Vietnam, he started with a dozen M70s chambered in .30-06 Springfield he'd snitched from Camp Pendleton's Special Services, which loaned them out for deer hunting. Then he got several more match-tuned M70s from the Corp's marksmanship unit. They were unloading them because the NRA had changed its rules and they no longer could use them in National Match competition.
Land sent some of his people to the PX in Okinawa to buy bases, rings and scopes, mostly Unertls. That was the gun Carlos Hathcock was issued in 1966 (the armorer's inspection tag on Hatchock's noted that his rifle's barrel had "mild pitting throughout").
When the Corps decided to turn loose of some cash so Land could expand his program, Winchester didn't show any interest in supporting them. Remington, on the other hand, appeared eager and even cut them a sweetheart deal. When Mawhinney got to Vietnam the standard issue sniper's rifle was an M700 (the first 700 were Model 40x's) chambered in 7.62 NATO. Most were fitted with a Redfield 3x9 scope.