When did USMC receive the M14 ??

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Does any know just when the M14 was issued to the Marines ? Date and Units.
A friend of mine turned in his M1 rifle at MCAS Beaufort in Jan. 1962 and was issued the M14 on that date. I would have suspected that Marine infantry units would have received the M14 earlier.
I am aware that the U.S. Army's 101st Airborne Div. started receiving the M14 in Jan. 1960 and the Berlin Garrison in early Sept. 1961. All combat units in Western Europe were equipped with the M14 by Oct 1, 1961.
Based on the above, I would guess the Marine Corps transitioned to the M14 between Oct. 1961 and Jan. 1962, but I can not find anything that gives the exact date the transition started and which units had priority. I was going to write to Leatherneck Magazine but thought one of you might have the answer.

Semper Fi