Not nostalgic for the M14
Same as Kraig, I qualified with the M14 in basic training, carried it through AIT, plus 6 months at Ft Benning. What a relief to have been issued an M16 when arriving Vietnam. Light, much more ammo to carry, and, at least in my brigade, no jamming or other reliability problems. A lighter weapon and ammunition load meant an infantryman could carry more grenades, water, Claymores, C rations, C4, etc.
Other than early teething problems with the M16, no infantryman humping soggy rice paddies and jungle preferred carrying an M14 instead of an M16. A good deal of nostalgia for the M14 seems to come from those who did not have to hump through those terrains.