M1 when I went thru basic in Ft Ord, 1963. First time I saw a M16 was for qualification prior to going to Nam in 67. Issued a 45 in Nam, but never fired it the entire year I was there.
Interesting reading about all the "worn out" M-16's in basic. I was a drill sergeant at Ft Leonard Wood in the mid 70's, and if you saw how they were treated cycle after cycle, you'd wonder how they could hit anything.